Two sums of money are proportional to 5 : 9. If the first sum is 55, then the second sum is:

Correct option is A

Given:

Two sums are in proportion = 5 : 9

First sum = 55

Solution:

Let the sums be $$5x$$​ and $$9x$$​​

According to question:

​$$5x =55$$​​

​$$x=11$$​​

Second sum is $$9x = 9 \times 11 = \bf 99$$​​

Alternative Method:

Sums are in proportion = 5 : 9

Other sum is =$$\frac{55}{5}\times 9 = \bf 99$$​​