Question

a total of 91 boys are seated in three rows.the ratio between the number of boys seated in the first and the second row is 5:2 respectively and the ratio between the number of boys seated in the second and the third row is 1:3 respectively.how many boys were there in the second row?

Answer 1

first : second =5:2
second: third= 1:3 ×2
first : second : third = 5 : 2 : 6
first row = 5x
second row= 2x
third row = 6x
5x + 2x + 6x = 91
13x = 91
x = 91 / 13
x = 7
the boy's in second row = 2x = 2×7 = 14

Answer 2

Answer:

Step-by-step explanation:

5:2

1:3=1*5=5, 1*2=2 and 2*3=6, so the new ratio is 5:2:6 so, 2/5+2+6= 2/13*91=14 Ans