7th grade math
Can you check these?
1. Olivia typed 2 pages in 15 minutes. Write an equation relating the number of minutes m to the number of pages typed. How long will it take her to type 10 pages at this rate?
Ans: 15/2 = 7.5
= 7.5 * 10
= 75 minutes
2. If the ratio of Type O to nonType O donors at a blood drive was 37:43, how many donors would be Type O out of 300 donors?
Ans: 37/43 = x/300
43x = 11100
x = 258 donors
3. The ratio of 7th grade students to 8th grade students in a soccer league is 17:23. If there are 200 students in all, how many are in the 7th grade?
Ans: 17/23 = x/200
23x = 3400
x = 148 7th grade students

2. D+N=300 where D/N= 37/43
37N/43+N=300
80N=43*300
N=1290/8=161 non donors
D= 300161= not your answer.
on your ratio,you should have used
37/(43+37)=x/300= donors/total
or 37*300/80=xposted by bobpursley

On the last, you did the same error, you need to do 7th/total=17/40
posted by bobpursley

I'm confused and not sure of the difference. When do i use the ratio vs when do i have to add ratios? I posted a couple of questions like that and was told they were wrong.
Example#4. 5 out of 6 students prefer pepperoni to sausage.
If Ms. Greene has 120 students, how many prefer pepperoni?
original ans:
5/6 = 5/5+6 = 5/11
5/11 = x/120
11x = 600
x = 55 students
corrected ans:
5/6 = x/120
6x = 600
x = 100posted by Alexis

First for number 1 you would have to divide 15 by two since it is two pages. then you would multiply that by 10. so 15/2=7.5 7.5x10=75. so the answer to number 1 is 75 minutes. you are correct! hope this helps!
posted by ..........

Joel and two friends went to the movies. They each bought a medium popcorn. Altogether, they spent $45. Write and solve an equation to determine how much each boys spent on a movie ticket?
posted by Eve

wihch of the following pairs represent the same. rational number 7\21 and 3\9
posted by Anonymous

Number 5,2,7,4 are wrong
posted by Youll never know!

Hi I love you
posted by Karina Kichuk
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