Arrange the given ratios in descending order:

a. 7 : 15

b. 15 : 23

c. 17 : 25

d. 21 : 39

Choose the correct answer from the options given below:

If A : B = 4 : 5, B : C = 4 : 15 and C : D = 5 : 16 Than find the ratio between A and D :

There are 48 students in a college gathering. The ratio of the number of boys to the number of girls in the gathering is 5:3. If the ratio of the boys to girls has to be made 6:5, then how many girls need to be added to the gathering, without changing the numbers of boys who are attending the gathering?

One-half of a certain number is equal to 65% of the second number. What is the ratio of the first number to second number?

Three persons A, B and C start a venture with capitals ₹ 1,20,000; ₹ 90,000; and ₹ 60,000 respectively. After 4 months A withdraws ₹ 20,000; after 8 months B adds ₹ 30,000. At the end of year the profit is ₹ 2,88,000. Find C's share.

The present age of P and Q are 40 and 33 years respectively. After X years, the ratio of ages of Q and P to will be 5:6. What is value of X?

A is younger than B by 7 years. If their ages are in the respective ratio of 7 : 9 then how old is A?