Question

If the ratio in the class of boys to girls is 5 to 10, then how many boys are there in a class of 30 kids?

Answer 1

howcome

Answer 2

or am i wrong??

Answer 3

let girls be 5x
boys = 10x

Answer 4

5 boys ten girls, or five boys 15 kids. so 30 kids 10 boys

Answer 5

total = 30
so 5x+10x = 30

Answer 6

for 15 students there are 5 boys and 10 girls
for 30 students there are 10 boys and 20 girls

Answer 7

imran got it right

Answer 8

sry i read wrong

Answer 9

i read girl to boy is 5 10

Answer 10

6 boys

Answer 11

the ratio is 1:2 :)

1:2 = 3

5(1:2 = 3), 5:10 = 15

10(1:2 = 3), 10:20 = 30

Answer 12

what????

Answer 13

ya amistre is right

Answer 14

10 are viewing this

Answer 15

yup

Answer 16

so wats the right answer

Answer 17

so 20 right?

Answer 18

lol ... the right answer is in the journey ;)

Answer 19

lol

Answer 20

imran is correct. In fancy formulæ:

We know that for every 10 girls, there are 5 boys:
\[10b=5g\]\[g=2b\]A classroom composed of girls and boys makes up a total of 30 kids:
\[g+b=30\]By substituting:
\[2b+b=30\]\[3b=30\]\[b=10\]Therefore, there are 10 boys in the classroom. QED

Answer 21

Bonus points for using the æ ligature, across :p