Question

Average cost of 5 apples and 4 mangoes is Rs. 36.

The average cost of 7 apples and 8 mangoes is Rs. 48.

Find the total cost of 24 apples and 24 mangoes?

A. 324 B. 1044 C. 2088 D. 720

Answer 1

let the cost of one apple be x and of one Mango be y
now from question
(5x+4y=36)*2=10x+8y=72. -eq(1)
7x+8y=48. -eq(2)
now (1)-(2)eq
10x+8y=72
-7x-8y=-48
=3x=24=x=8
now put the value of x in any eq and u will get the value of y that is -1
so valueof 24apples and 24mangoes= 24*8-24=192-24=168answer

Answer 2

Avg cost of 5 apples and 4 mangoes = 36
Total cost of 5 apples and 4 mangoes = 36*9 = 324
[Avg = sum total/Number]

Similarly, total cost of 7 apples and 8 mangoes = 48*15 = 480+240 = 720
If i combine these two, i have 12 apples and 12 magoes
Cost of 12 apples and 12 mangoes = 324+720 = 1044 Rs.
Cost of 24 apples and 24 mangoes = 2*1044 = Rs. 2088
Hope it helps.