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Also a quick and simple question that is answered by me.

" Jack is 5 years younger than James if the sum of their ages is 37, how old are they now? "

[ANSWER]
Using x for the value.

"; Jack ks 5 years younger "
— ( x - 5 )
↓
x+(x-5)=37
x+x=2x
↓
2x=37+5

; Since we transfered "-5" into another place, we will have to change "-" into "+".
↓
2x 42
__ = __
2x 2

; [ 37+5 = 42, so bring down 42 then also bring down 2. ]

; Now our job is to cancel them both together.

that leads us to

" x=21 "

so then:

21-5=16 And which means Jack is 16 and James is 21!
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