The ratio of boys to girls in a classroom is 2:5
Add the two numbers:
2 + 5 = 7
Divide the gotten number by the total amount
70/7 = 10
Multiply each ratio number individually with gotten amount.
10 x 2 = 20
10 x 5 = 50
The ratio of boys to girls is 20:50, with 50 of them being girls.
50 is your answer
hope this helps
