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 $\dfrac{n}{n-15}$ times heavier then her sister.

Step-by-step 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 :-

$\dfrac{\text{Mary's weight}}{\text{Sister's weight}}\\\\=\dfrac{n}{n-15}$

Hence, Mary is $\dfrac{n}{n-15}$ times heavier then her sister.

Answer 2

Answer:

Mary is  $\frac{n}{n-15}$  times heavier than her sister

Step-by-step 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)