A class of 30 students appeared in a test. The average score of 12 students is 80, and that of the rest is 70. What is the average score of the class?

Find the simple interest (in ₹) on ₹2500 as a sum borrowed at 4% per year rate of interest for 4 years.

Study the given graph and answer the question that follows.

The graph shows the sales of three products: P, Q and R by four companies: A, B, C and D.

How much more in percentage is the total sales of R than total sales of P (rounded off to one decimal place)?

A shopkeeper makes a 15% profit on a sale. He would have made 18%, if he had sold it for Rs.18 more. The cost price of the article is:

Find the HCF of 24, 36 and 60.

A 725 m long train passes through a 235 m long tunnel in 48 sec. Find the speed of the train.

The number of three different types of motor bikes B1, B2, and B3 manufactured by a company in three months is given in the following table. Study the given table carefully and answer the question that follows.

What is the average number of motor bikes manufactured by the company in the month of November?

A merchant has 5000 kg of Basmati rice. He sells some part of this Basmati rice at 20% profit and the rest at 35% profit. He gains 29% in the entire transaction. What is the quantity sold at 20% profit and 35% profit, respectively?

If tea that costs ₹7.50 per kg is mixed with tea that costs ₹10.50 per kg in the proportion of 2:1 then, what is the cost (in ₹) of the resultant mixture per kg?

A train travelling at a speed of 60 km/h leaves station A at 7:00 a.m. and another train travelling at a speed of 84 km/h starts from station A at 9:30 a.m. in the same direction on a parallel track. At what distance (in km) from station A and after how many hours of travel of the second train will they be together? Express your answer in the same order.

A hemispherical bowl is of radius 7.7 cm. It is to be painted from inside as well as outside. Find the cost (in ₹) of painting the bowl at a rate of ₹17 per 7 cm² ? (Take ∏= 22/7)

Find the simple interest (in ₹) on &2500 as a sum borrowed at 4% per year rate of interest for 5 years.

A person deposited ₹2,500 in a bank that pays 8% simple interest. He withdrew ₹1,000 (from amount) at the end of the first year. What will be his balance after 4 years?

By selling an article for ₹19, a dealer makes a profit of 20%. By how much should he increase his selling price (in ₹, rounded off to two decimal place) so as to make a profit of 40%?