In a saving box, there are three kinds of coins: $1 coins $2 coins $5 coins. It is known that the number of $1 coins is twice as many as $2 coins.24% of the coins is $1 coins. If the total value of the coins in the saving box is $920, use equation to find the total number of coins in the saving box.
你地識唔識呀 ??
一條Math Question*
2007-08-05 10:51 pm
回答 (3)
2007-08-05 11:04 pm
✔ 最佳答案
let the total no. of coins in the box be q24%q+2(12%)q+5(64%)q = 920
3.2q+0.48q = 920
q = 250
.'.the total number of coins in the saving box is 250
2007-08-06 8:11 pm
24%q+2(12%)q+5(64%)q = 920
0.24q+2(0.12q)+5(0.64q) =920
3.2q+0.48q = 920
q = 250
0.24q+2(0.12q)+5(0.64q) =920
3.2q+0.48q = 920
q = 250
2007-08-06 12:30 am
24%q+2(12%)q+5(64%)q = 920
3.2q+0.48q = 920
q = 250
3.2q+0.48q = 920
q = 250
收錄日期: 2021-04-13 00:58:28
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070805000051KK02213