The average of 13 numbers is 57. The average of first 3 numbers is 48, and that of the next 7 numbers is 58. The 11th number is two times the 12th number and 12th number is 3 less than the 13th number. What is the average of the 11th and 13th numbers ?

Challenger App

Home/

Questions/

Maths/

Average

No.1 PSC Learning App

★

1M+ Downloads

Get App

The average of 13 numbers is 57. The average of first 3 numbers is 48, and that of the next 7 numbers is 58. The 11th number is two times the 12th number and 12th number is 3 less than the 13th number. What is the average of the 11th and 13th numbers ?

A18

B72

C27

D36

Answer:

B. 72

Read Explanation:

Read more in App

Related Questions:

The average monthly expenditure of a family was ₹88,600 during the first three months, ₹9,750 during the next four months and ₹9,920 during the last five months of a year. If the total savings during the year was ₹65,300, the average monthly income (in ₹) of the family was:

രണ്ട് കുട്ടികൾ ക്ലാസ് വിട്ടപ്പോൾ ഒരു ക്ലാസിലെ 20 വിദ്യാർത്ഥികളുടെ ശരാശരി ഭാരം 1 Kgവർദ്ധിച്ചു. ആ രണ്ട് വിദ്യാർത്ഥികളുടെ ശരാശരി ഭാരം 60 Kg ആയിരുന്നുവെങ്കിൽ, തുടക്കത്തിൽ ശരാശരി ഭാരം എത്രയായിരുന്നു ?

The average of first 102 even numbers is

The average of first 117 even numbers is

The mean of 36 numbers was found as 42. Later on, it was determined that a number 47 was misread as 41. Find the correct mean of the given numbers (rounded off to two decimal places).