Question

12. A number is divided in the radio 9:11. If the first part is 72. find the number.
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Answer 1

Answer:

Ratio = 9 : 11

First part = 9x = 72

=> x = 72/9 = 8

Therefore, second part = 11x = 11 X 8 = 88

Therefore, number = 72 + 88 = 160

Answer 2

Let the number be h

Here, the ratio of division of h is 9:11

Then,

• 1st part = 9h/20
• 2nd part = 11h/20

Given,

• 1st part = 72

$\huge \tt= > \frac{9h}{20} \: \: = 72 \\ \\ \huge \tt= >h = \frac{72 \times 20}{9} \\ \\ \huge \tt= >h = \frac{8 \: \cancel{72} \times 20}{\cancel9} \\ \\ \huge \bf= >h = 8 \times 20 \\ \huge \bf= >h = 160$

Thus,

• It is found that the number h is 160