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28-01-2021
Mathematics

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a half of whats johns age was 4 years ago is equal to one third of what will be in 5 years time. how old is john now?

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28-01-2021

Let x = John's age now

half of what johns age was 4 years ago: (1/2)(x-4)

is equal to one third of what it will be in 5 years time: (1/3)(x+5)

(1/2)(x-4) = (1/3)(x+5)

3(x-4) = 2(x+5)

3x - 12 = 2x + 10

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