Question

the sum of three numbers is 80 . if the ratio of first to the second numbers is 7:5 and that of the second to the third is 5:4 , then what is the second numbers ?

Answer 1

Answer:

let the three numbers be 7x, 5x and 4x.

then, sum of all three = 80

7x+5x+4x=80

16x=80

x=80/16

x = 5

there second number i.e. 5x is 5×5=25