I don't understand this question about Ratio, help?
2017-01-29 9:37 pm
At a birthday party there are three types of costume. Superheroes, princesses and celebrities. The ratio of superheroes tp princesses is 5:4 and the ratio of princesses to celebrities is 3:1. In total there are 93 costumes, how many people are dressed as princesses?
回答 (2)
2017-01-29 9:59 pm
✔ 最佳答案
One way is to get similar ratios so that the number corresponding to princesses is the same in both ratios, since princesses is the one that's mentioned in both ratios, by multiplying each ratio number by the same thing:superheroes : princesses = 5:4, each times 3 =15:12
princesses : celebs = 3:1, times 4 = 12:4
So now you have superheroes: princesses: celebs = 15:12:4.
Put a variable with these and make an equation.
15x = number of superheroes
12x = number of princesses
4x = number of celebs
15x + 12x + 4x = 93
31x = 93
x = 3
15x = 45 = superheroes
12x = 36 = princesses
4x = 12 = celebs
2017-01-29 11:45 pm
5/4 3/1
make 3 and 4 equal
3/3*5/4,4/4*3/1
15/12,12/4
15+12+4=31
if 31 =93
12=93*12/31=36
15=45
4=12
45/36=5/4
36/12=3/1
make 3 and 4 equal
3/3*5/4,4/4*3/1
15/12,12/4
15+12+4=31
if 31 =93
12=93*12/31=36
15=45
4=12
45/36=5/4
36/12=3/1
收錄日期: 2021-04-24 00:12:18
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20170129133751AAL8O8t