A father' is three times as old as his son. Four years ago, he was four times as old as his son How old was his son, 10 years ago?
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Sᴜʀᴇ ᵃⁿˢʷᵉʳ ︎︎︎︎︎︎︎
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Step-by-step explanation:
son's age x
father's age 3x
4 years ago
son's age x-4
father's age3x-4
father 4 times older
3x-4=4(x-4)
3x-4=4x -16
-x=-16-4
-x=-12
x=12 son's age
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