Question

Deola is 7yrs older than her brother, Femi who is x yrs old. The sum of their ages is 29yrs. How old is Deola

Answer 1

Let the age of Femi be x years (Given)

Deola is 7 years older than her brother, Femi (given)

So, let Deola's age be x + 7

Sum of their ages is 29 years


According to given condition,

x + x + 7 = 29

➾ 2x + 7 = 29

➾ 2x = 29 - 7

➾ 2x = 22

➾ x = 11


∴ Present age of Femi ➾ x

➾ $\green{\boxed{\green{\boxed{\red{\textsf{11\:years}}}}}}$


∴ Present age of Deola ➾ x + 7

➾ 11 + 7

➾ $\green{\boxed{\green{\boxed{\red{\textsf{18\:years}}}}}}$

Answer 2

let the age of deola be y

ACC to the question
x= y-7
x-y=-7-------2

and

x+y= 29-----1

add 1 and 2

x+y+x-y= 29-7
2x=22
x = 11

sub x = 11 in 1

11+y = 29
y= 29-11
y = 18

Therefore Deola is 18 years old