In 7 years’ time the combined age of my sister n her three children will be 92.Wat will it be in 4 years’ tym

Need help with this question. Thanx

Hi Sofiara

Every year, four people (sister, and three children) have their age increase by 1. Therefore, every year the combined age will go up by 4. In seven years, the combined age is 92. Cool.

Seven years is three more years than four. This means that the four year total (which you are looking for) has had three fewer total age increases. Since each age increase was 4 years, this means the total age is 3 * 4 = 12 less after 4 years, than it is after seven. And 92 - 12 = 80. So 80 is the sum of the ages of the four people in 4 years time.

a = age of your sister now
b = age of your sister's child
c = age of your sister's second child
d = age of your sister's third child

(a + 7) + (b + 7) + (c + 7) + (d + 7) = 92
a + b + c + d + 28 = 92
a + b + c + d = 64

(a + 4) + (b + 4) + (c + 4) + (d + 4) = ?
a + b + c + d + 4 + 4 + 4 + 4 =>
(a + b + c + d) + 16 =>
64 + 16 =>
80

80

♥♦♣♠
let C = combined age

in 7 years:
C + ( 7 • 4 ) = 92
C + 28 = 92
C = 64

combined age in 4 years:
= C + ( 4 • 4 )
= 64 + 16
= 80
░░░░

Not sure what a tym is, or if you deliberately chose to spell time wrong since you spelled it right before, but 92 - 12 = 80.

Thats an impossible question hon, it has no sollution.