有一题请各位大侠帮忙！

bill-bill

lily and briony work together selling computers during the school holidays
briony receives a wage of $20 per hour plus a week plus a commission of 5% of the sales of computers that she sells .lily receives a wage of $15 per hour plus a week plus a commission of 7.5% of the sales of computers that she sells .
1.in the first week of the holidays,both lily and briony work for 15 hour during the holidays and briony earnt 20% more than
lily. use an equation to determine the amount$ of computers that each gril sold .write your answer correct to the nearest cent

谢谢

james988

briony receives a wage of $20 per hour <strong>plus a week </strong>plus a commission of 5% of the sales of computers that she sells
Plus a week哈意思？

bill-bill

james988 发表于 2019-4-14 18:25
briony receives a wage of $20 per hour plus a week plus a commission of 5% of the sales of computers ...

就是不知道呢，原题是这样的

act_nan

20*15+5%*X = (15*15+7.5%*Y)*(1+20%)

Angelp909

Set X as $ of Computer sold:
Lili: 15X15 + 0.075X=225+0.075X
Briony: 20X15 + 0.05X=300 + 0.05X
(300+0.05X)-(225+0.075X)=0.2(225+0.075X)
75-0.025X=45+0.015X
X=30/0.04=750

bill-bill

Angelp909 发表于 2019-4-18 11:28
Set X as $ of Computer sold:
Lili: 15X15 + 0.075X=225+0.075X
Briony: 20X15 + 0.05X=300 + 0.05X

谢谢