Question

In school there are 550 students if the ratio of lefties to righties is 2:9 how many lefties are in the school

Answer 1

100

Explanation:

550=L+R

2/9=L/R

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Solve the second for L: 2R/9=L

Plug this into the first: 550=2R/9 +R

(2/9+1=11/9) So : 550=11R/9

Now multiply both sides by 9/11: 550(9)/11=R

R=50(9)=450

L=550-R=550-450=100

There are 100 lefties