Question

A student spends 30% of hos money amd has rs. 21 left. Find his money

Answer 1

Let the amount of his money be x

30% of X = 21

30/100 X x = 21

30x/100= 21

x = 21 X 100 / 30

x = 7 X 10

x = 70

His money is rs. 70

Answer 2

Answer:

The student's money is rs. 30.

Step-by-step explanation:

A student spends 30% of his money.

Let the money of the student is 100%.

If he spends 30% of his money, then he has left money = 100% - 30% = 70%

The student has left money = rs 21

According to question,

70% of the students money is left which value is rs. 21.

Then, we can say that

70% of the student money is equal to rs.21.

or,

$70\% \: = 21$

or,

$1\% \: = \frac{21}{70}$

or,

$100\% \: = \frac{21}{70} \times 100$

or,

$100\% = \frac{2100}{70}$

or,

$100\% \: = 30$

The student's money is rs 30.

He spends money=

$30\% \: of \: rs \: 30$

=

$= \frac{30}{100} \times 30$

$= \frac{900}{100}$

$= rs \: 9$

Conclusion:

The student's total money is rs. 30 and he spends rs. 9.