Question

Alka spends 90% of the money that she receives every month, and saves Rs. 120. Hon
much money does she get monthly ?​

Answer 1

Step-by-step explanation

let the total money be x

now money she spends = 90x/100

money she saves = 120

NOW

90x/100 + 120 = x

x - 90x/100 = 120

10x/100 = 120

x = 120 x 100/10

x = 1200

she earns 1200

Answer 2

Let,

the monthly income she get = x Rs.

then,

the money spend by her = $\frac{90}{100}*x=\frac{9x}{10} Rs.$

and the money she save = 120 Rs.

then, the sum of money she spend and she save will give us her actual monthly income

so,

$\frac{9x}{10} + 120 = x\\\\( taking\:LCM\:in\:LHS)\\\\\frac{9x+1200}{10} =x\\\\(cross\:multiplying)\\\\9x+1200=10x\\\\1200=10x-9x\\\\x=1200\\\\\pink{\boxed{hence\:her\:actual\:income\:is\:1200\:Rs}}$