A mother's age is now 3 times that of her son. 8 years age, the mother's age was greater than 4 times that of her son by 4. Find the son's present age.
A mother\'s age is now 3 times that of her son.
媽媽的歲數是兒子的 3 倍
8 years ago, the mother\'s age was greater than 4 times that of her son by 4.
8年前，媽媽的歲數是兒子的 3 倍
Find the son\'s present age.
求兒子現時的歲數
A mother\'s age is now 3 times that of her son. 8 years age, the mother\'s age was greater than 4 times that of her son by 4. Find the son\'s present age.
y=3x -------- (i)
y-8=4(x-8)+4 -- (ii)
sub (i) into (ii)
3x-8=4(x-8)+4
3x-8=4x-28
x=20
y=60
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