the sum of sid's and Sue's ages is 30. If 8 years ago Sid was as old as Sue was 2 years ago, then how old is Sue now?

GamingKev Feb 8, 2019

#1**+2 **

Let Sid's age be A

Then Sue's age is 30 - A

And 8 years ago....Sid's age was A - 8

And 2 years ago, Sue's age was 30 - A - 2 = 28 - A

And we know that

A - 8 = 28 - A add A, 8 to both sides

2A = 36 divide both sides by 2

A = 18

So... Sue is 30 - 18 = 12

CPhill Feb 8, 2019

#2**+1 **

Since we are looking for Sue's age now, let x = Sue's age now

x+SID =30

and

SID-8 = x-2 re-arrange

SID = x+6 sub into the first equation

x + x+6 = 30

x = 12

ElectricPavlov Feb 9, 2019