Question

Rohit donated 1/5
of his monthly Income to an Nongovernment Organisation (NGO)
working for the education of the girl child, spent 1/4 of his salary on food 1/3
on rent and 1/15
on other expenses. He is left with
9.000,
(a) Find Rohit's monthly salary.
​

Answer 1

let rohit's monthly salary be x.

money spend on NGO = x/5

money spend on food = x/4

money spend on rent = x/3

money spend on other expenses = x/15

amount left = 9000

A/Q,

x - ( x/5 + x/4 + x/3 + x/15 ) = 9000

=> x - ( 12x + 15x + 30x + 4x /60 ) = 9000

=> x - ( 51x/60 ) = 9000

=> 60x - 51x = 9000 × 60

=> 9x = 9000 × 60

=> x = 9000 × 60 /9 = 60000

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