Question

1. if 60% of 3/5 of a number is 36, then the number is......... Pls show working. 2. the average weight of 16 boys in a class is 50.25kg and that of the remaining 8 boys is 45.15kg. Find the average weight of all the boys in the class.

Answer 1

60% = 3/5, so

(3/5)(3/5)x = 36
x = 36(5/3)(5/3) = 100

for the boys, we have the average as

16*50.25 + 8*45.15
----------------------- = 48.55
16+8

Answer 2

thanks