Question

mr.manohar gave 20% part of his income to his elder son 30% part to his younger son. he gave 10% of the balance as donation to school. he still had rs 180000 for himself. what was mr.manohar income?

Answer 1

Mr. Manohar's income = A.
Amount given to elder son = 20% of A = 20/100 * A = A/5
Amount given to younger son = 30% of A = 3/10 * A

Balance = 100 % - 30% - 20% = 50% of A = 1/2 * A 

Donation given to school = 10% of A/2  =  10/100 * A/2 = A /20
Balance =  A/2 - A/20 
          = A * 9/20

So   9 A /20 = Rs 1,80,000
          A = Rs 1,80,000 * 20/9
              = Rs 4, 00, 000.
Income is Rs 4 hundred thousand.