Question

Mary is 23years old in 7years to come a. How old will be in 4years ago?
b.How old will be in 10 years to come?

Answer 1

Answer:

Let the current age be X.

In five years time, 3 times old as three years ago,

Formualating it to an equation,

X+5 =3(X-3)

X + 5 = 3X - 9

2X = 14

X = 7.

The present age is 7.

Answer 2

Answer:

let Mary's present age be x.

in 7 years to come she will be 23 years old.

• x + 7 = 23 years
• x = 23 - 7 years
• x = 16 years

a) 4 years ago

• x - 4 = 16 - 4 = 12 years
• 4 years ago Mary was 12 years old.

b) in 10 years to come

• x + 10 = 16 + 10 = 26 years
• in 10 years to come Mary will be 26 years old.

hope it helps

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