A few days ago
Pre-Algebra Question (please explain)?
The ration of the number of boys to the number of girls in a middle school is 4.5 to 5. If the number of boys in the school is 153, how many girls are in the school?
A.138
B.170
C.291
D.323
Top 4 Answers
A few days ago
Favorite Answer
a. 138
becuz 4.5 divided by 5 equals x divided by 153, so x would have 2 b 138
hope i helped
vassii <3...
0
A few days ago
Okay, so you know that the ratio of boys to girls is 4.5 to 5, so you make that a fraction- which is- 4.5/5
Since you also know that the number of boys in the school is 153, you put 153/x because you want to know how many girls there are.
You set them equal to each other in proportion and solve.
4.5/5= 153/x
Cross multiply.
153*5=743, so you do 763=4.5x
To isolate the x, you divide 763 by 4.5
You should get x=170, so B is your answer.
I hope you understood my steps!
0
A few days ago
B. For every 4.5 boys theres 5 girls so how many 4.5 boys are there (divide 153 by 4.5) = 34. so theres 34 groups in which each group has 4.5 boys and 5 girls, so 34X5=170 number of girls.
0
A few days ago
4.5/5=153/g, cross multiply so that you get 4.5 x g=5 x 153, thus 4.5 x g=765, solve for g by dividing by 4.5 to get 170
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