The ages of John & Jack is 4:7. If John is l2 yrs old, what is Jacks age ?
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Step-by-step explanation:
john age=4x
jack=7x
jack age+12=4x
7x+12=4x
7x-4x= -12
3x= -12
x = -4
john age= 4×4
=16
jack=7×4
=28
because the age is never be written in negative so take the value of x in positive
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