Question

the ratio of the incomes of rahul and keshav is 5:4 . if rahul's income is ₹18000, what is the income of keshav.?

Answer 1

let income of Rahul=x
5:4=18000:x
5x=4×18000
x=4 ×18000
_______
5
x=₹14400
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Answer 2

5x+4x=18000
9x=18000
x= 18000/9
x=2000
5x=5×2000
=10000
4x=4×2000
=8000 is the income of keshav.