The ratio of boys to girls in high school is 4: 7. if there were 300 more girls than boys, how many boys were in school? how many girls?

Step-by-step explanation:

Let G and B be the number of girls and boys.

The ratio boys to girls was 4 to 7.

This means

B/G = 4/7

There were 300 more girls than boys.

This means

G = B+300

Replace in the first equation and solve for B

B/(B+300) = 4/7 ===> 7B = 4(B+300) ===> 7B = 4B + 1200 ===>

===> 7B-4B = 1200 ===> 3B = 1200 ===> B=1200/3 ===> B=400

G = B+300 ===> G = 400 + 300 ===> G=700

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)