Question

A man spends 1/4 of his income on food,1/5on rent and the rest 231 on other items .calculate his total income?

Answer 1

1/4 + 1/5 = 5+4/20

so thats 9/20 , now the rest is 231, so 231 is 11/20 of his income so 1/20 of the income will be 231/11 which = 21

21*20 = 420, thats your answer