Jack is 13 years older than Bao. In 8 years, he will be twice as old as Bao. How old is Jack now?

Guest Jun 24, 2020

#1**+2 **

So we can express jacks curent age as x, and bao's current age as x-13. It says that 'In 8 years, he will be twice as old as Bao" and we can express that as x+8=2(x-13+8) which we can simplify to x+8=2x-10 from here x=18, so jack is curently 18.

ItzMe Jun 24, 2020

#2**0 **

j = 13 + b and in 8 years j +8 = 2(b+8) (or (j+8)/2 -8=b)

j = 13 + (j+8)/2 - 8

1/2 j = 13 +4-8

j = 18 b = 5 in 8 years j = 26 b = 13

ElectricPavlov Jun 24, 2020

#3**0 **

Let's make two equations!

Let j=Jack's age

Let b=Bob's age

j-13=b

j+8=2(b+8)

--Expand--

j-13=b

j-8=2b

--Subtract equations--

-5=-b

b=5

(Bob is 5 years old now)

18-13=5

So, Jack is 18 years old!

CalTheGreat Jun 24, 2020