SOLUTION: There are 840 pupils in a school. The ratio of boys to girls in school is 5:7. Calculate the number of boys.

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: There are 840 pupils in a school. The ratio of boys to girls in school is 5:7. Calculate the number of boys.      Log On


   

Question 672345: There are 840 pupils in a school. The ratio of boys to girls in school is 5:7. Calculate the number of boys.
Answer by checkley79(3341) About Me  (Show Source):
You can put this solution on YOUR website!
5+7=12 TOTAL ELEMENTS
840/12=70 PER ELEMENT.
5*70=350 BOYS
7*70=490 GIRLS.
PROOF:
350+490=840