Question

a number is four fifth of the Other if their sum is 180 find the number

Answer 1

let the no. be x
therefore other no.=4x/5
acc.to question:-
x+4x/5=180
cross multiplying:-
5x+4x/5=180
5x+4x=180*5
9x=900
x=900/9
x=100
other no.=4*100/5=80

Answer 2

Ans

Let the second number be X.

Then the first Number = 4/5 X = 4X/5.


According to question,


4X/5+ X = 180

4X + 5X /5 = 180


9X = 180 × 5

X = 180×5/9 => 20 × 5 = 100

Other Number = X = 100


One Number = 4X/5 = 4 × 100/5 = 4×20 = 80