There are a total of 24 blue pencils and red pencils in a box. The ratio of the number of blue pencils to the number of red pencils is 7:5. How many blue pencils are in the box?

Question

A- 7

B-10

C-12

D-14

Answer 1

B+R=24

B/R =7/5

B= 7R/5

7R/5 +R =24

12R/5 = 24

R/5 =2

R=10 Red pencils in the box

14 Blue

14/10 =7/5