A person spends half if his salary on rent . 1/4 th on expenses and 1/5 th on personal. And saves 50 in the bank what is his salary
Total expenses :
1 / 2 + 1 / 4 + 1 / 5 =
10 / 20 + 5 / 20 + 4 / 20 = 19 / 20
1 - 19 / 20 = 20 / 20 - 19 / 20 = 1 / 20
A person save 1 / 20 part of salary.
S / 20 = 50 M ultiply both sides by 20
S = 20 * 50 = 1000