John"s savings is $300 more than his sister"s.
After giving $450 from his saving to his sister,
John "s savings becomes 2/5 of his sister"s.
how much savings do they have altogether?
一條數,,,唔識做=-=
2007-06-03 1:57 am
回答 (1)
2007-06-03 2:03 am
✔ 最佳答案
let x=john's總額, y=his sister總額x=y+300 -------- (1)
x-450=2y/5 -------- (2)
咁兩條公式搵兩個unknow,你識做啦^^
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