Question

Mary weighs n kg while her sister weighs 15 kg less. How many times is Mary heavier than her sister?

Answer 1

Answer: Mary is
`(n)/(n-15)` times heavier then her sister.

Explanation:

Given : Mary weighs n kg while her sister weighs 15 kg less.

Then, the expression to represent her sister's weight = n-15

Now, the number of times Mary is heavier than her sister is given by :-

`\frac{\text{Mary's weight}}{\text{Sister's weight}}\\\\=(n)/(n-15)`

Hence, Mary is
`(n)/(n-15)` times heavier then her sister.

Answer 2

Mary is
`(n)/(n-15)` times heavier than her sister

Explanation:

Mary's Weight = n

Sister's Weight = n - 15

To find how many times mary is heavier, we need to multiply "that many time" [let it be x] with sister's weight to get Mary's weight.

e.g. If someone weighs 100 and another person 50, 50 * 2 = 100, thus, 100 kg person is 2 times heaving. We do same for this:

(n - 15) * x = n

x = n/(n - 15)