Question

After 15 years ,marys age will be four times of her present age.find her age after 3years back​

Answer 1

Answer:

57 years

Step-by-step explanation:

15×4= 60 years -3years

Answer 2

Given :-

After 15 years Mary’s age will be four times of her present age.

To Find :-

Age of Mary 3 years back.

Analysis :-

Consider Mary's present age as a variable.

Make an equation and solve it accordingly and find the present age of Mary.

Since the question wants us to find her age 3 years back, subtract 3 from Mary's present age.

Solution :-

Let Mary's present age be x.

Age of Mary after 15 years = x + 15

Making an equation,

$\sf 15 + x = 4x$

$\sf 3x = 15$

Finding the value of x,

$\sf x=\dfrac{15}{3}$

$\sf x=5$

Therefore, Mary's present age is 5 years.

Age 3 years back = Present age - 3

By substituting,

Age 3 years back = 5 - 3 = 2

Therefore, Mary's age 3 years ago is 2 years.