標題:
MATHS EASY
發問:
THE DIFFERENCE BETWEEN THE PRESENT AGES OF MR .CHAN AND HIS SON IS 32. 6 YEARS LATER , THEIR TOTAL AGE WILL BE 50. HOW OLD IS MR .CHAN'S SON NOW .
最佳解答:
x-y=32 ------------- eq1 x+6+y+6=50 ----------------eq2 From equation 1, 32+y=x --------eq3 Substitute eq3 into eq2 32+y+6+y+6=50 2y=6 y=3 So Mr Chan's son is 3 years old now.
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其他解答:
let x be the age of Mr. Chan. let y be the age of his son. x-y=32 x=32+y (1) (x+6)+(y+6)= 50 (2) sub (1) into (2) (32+y)+(y+6)=50 2y=50-38 y=6 the age of Mr. Chan's son now is 6 years old
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