Muli spent 3/10 of thus salary on flood and 2/3 on rent. He was left with sh. 2100. what was his salary?

Muli's salary = 62,000

Step-by-step explanation:

Let Muli's salary be x.

Money spent on food = 3/10 of x = 3x/10

Money spent on rent = 2/3 of x = 2x/3

Money left with him = 2100

(3x/10) + (2x/3) + 2100 = x

x - (3x/10) - (2x/3) = 2100 (LCM = 30)

30x/30 - 9x/30 - 20x/30 = 2100

(30x - 9x - 20x) / 30 = 2100

x/30 = 2100

x = 2100 * 30 = 62,000

Step-by-step explanation:

Let the total amount of salary be X, then

3/10X + 2/3X + amount left = his salary (X)

(9X + 20X) / 30 + 2100 = X

29X/30 - X = - 2100

(29X - 30X) / 30 = - 2100

by cross multiplying

-X = - 2100*39

-X = - 81900

divide both side by - 1

X = 81900.

therefore his salary = 81900