Challenger App

No.1 PSC Learning App

1M+ Downloads
In a party, one-fifth of the guests wanted cool drinks only. Out of the remaining, half of them liked coffee and two-thirds like tea. If 12 of the guests opted for both coffee and tea, how many guests had attended the party?
Two students appeared for an examination. One of them got 9 marks more than the other. His marks was also equal to 56% of the sum of their marks. What are their marks?
image.png
Complete the series. 755, 151, 75.5, 15.1, (…)

In this question, a statement is given followed by two conclusions. Choose the conclusion(s) which best fit(s) logically.

Statement:

Vegetable prices are soaring in the market.

Conclusions:

I. Vegetables are becoming a rare commodity.

II. People cannot eat vegetables.

If a, b, c and d are 4 whole numbers such that a + b + c = d where a, b, d are all odd numbers, then find c.
image.png
What will come in the place of '*'? 18/* = 2/7
If 4 @ 9 # 3 = 1 and 4 @ 8 # 4 = 2, then 5 @ 6 # 2 = ?
Four vessels of equal size are filled with mixtures of milk and water. The strength of milk in the four vessels is 80%, 75%, 60% and 50% respectively. If all four mixtures are mixed, what is the ratio of water to milk in the resultant mixture?
Find the ODD one out from the given options
Rs.12000 invested at 10% Simple Interest and another investment at 20% Simple Interest together give a 14% income on the total investment in one year. Find the total investment.
In how many years will Rs.5000 grow to Rs.10000 at 12.5% Simple Interest?
Rakesh is standing at a point. He walks 20 m towards east and further 10 m towards south. He then walks 35 m towards west and further 5 m towards north. Again he walks 15 m towards east. What is the shortest distance in meters between his starting point and the point where he is now?
image.png
Find the LCM of 1.05 and 2.1.
Which of the following is the first alkali metal?
Which of these can be a cause for soil erosion?
Who among the following inaugurated the Diffo Bridge in 2019?
If the time period of a sound wave is 0.02 s, then what is its frequency?
Which of the following countries was the host of Men's Hockey World Cup 2018?
Find the missing number in the following series. 864, 432, 440, 220, (…), 114
A train runs at a speed of 111 kmph to cover a distance of 222 km and then at a speed of 86 kmph to cover a distance of 258 km. Find the average speed of the train for the entire distance.
A vendor claims to sell wheat at a loss of 25%. But he cheats by using weights that weigh 55% less than what is mentioned on them. What is his profit percentage (rounded off to 2 decimal places)?

Simplify the following:

[(0.4)+(4.6)2+(2.3)2÷5]3.24[{(-0.4)+(4.6)^2+(2.3)^2}\div5]-3.24

For a positive integer b > 1, if the product of two numbers 6344 and 42b8 is divisible by 12, then find the least value of b.
A shopkeeper sells an item for ₹940.8 after giving two successive discounts of 84% and 44% on its marked price. Had he not given any discount, he would have earned a profit of 25%. What is the cost price (in ₹) of the item?
The price of fuel decreases by 60%, 30% and 20% in three successive months, but increases by 60% in the fourth month. What is the percentage increase/decrease in the price of fuel in the fourth month as compared to its original price?

Study the given table and answer the question that follows.

The table shows the monthly expenditure (in ₹) of five people on education, rent, food, conveyance and electricity

image.png

Find the difference between the average amount spent on education and the average amount spent on conveyance.

Given that 870.27=x87^{0.27} = x, 870.15=y87^{0.15}= y and xz=y6x^z = y^6 , then the value of z is close to:

image.png
image.png
image.png
A train runs at a speed of 84 kmph to cover a distance of 336 km and then at a speed of 96 kmph to cover a distance of 192 km. Find the average speed of the train for the entire distance.
400 chickooes were bought at ₹1410 per hundred and were sold at a profit of ₹860. Find the selling price (in ₹) per dozen of chickooes.
The average of eight numbers is 20. The average of five of these numbers is 15. The average of the remaining three numbers is
Lalit's average earning per month in the first three months of a year was ₹4080. In April, his earning was 75% more than the average earning in the first three months. If his average earning per month for the whole year is ₹66405, then what will be Lalit's average earning (in ₹) per month from May to December?
Ishita and Isha invest in a business in the ratio 31 : 23. If total profit is Rs. 2646, then what is difference between the profit (in Rs.) of Ishita and Isha?

Find the value of

image.png
At what rate per cent per annum will a certain sum of money multiply itself by 55 times in 2 years, the interest being compounded annually? [Give your answer correct to 1 decimal place.]
A water tank is in the form of a right circular cone with radius 3 m and height 14 m. The tank is filled with water at the rate of one cubic metre per second. Find the time taken, in minutes, to fill the tank.
The average of eight numbers is 20. The average of five of these numbers is 20. The average of the remaining three numbers is
Anmol completes his journey in 10 hours. He covers half the distance at 46 km/h and the rest at 69 km/h. What is the length of the journey (in Km)?
The average weight of 8 men is decreased by 3 kg when one of them whose weight is 56 kg is replaced by a new man. What is the weight of the new man?
Find the circumference (in m) of the largest circle that can be inscribed in a rectangle whose dimensions are given as 21 m and 115 m. take π=22/7
The smallest 1-digit number to be added to the 6-digit number 405437 so that it is completely divisible by 11 is:

Which of the following fractions is the largest?

image.png
Manish's average earning per month in the first three months of a year was ₹8784. In April, his earning was 25% more than the average earning in the first three months. If his average earning per month for the whole year is ₹99085, then what will be Manish's average earning (in ₹) per month from May to December?
Komal invested a sum of ₹5000 at 20% per annum compound interest, componded annually. If she received an amount of ₹7200 after n years, the value of n is:
Find the area of polygon ABCDE (in square cm) if AE = 20 cm and AB = 15 cm; quadrilateral BCDE is a square.