The classroom

In the seventh class, the number of boys and girls is at a ratio of 4:5. Boys are 16. How many total students are in the classroom?

Correct answer:

n =  36

Step-by-step explanation:

a=16 a:b=4:5  5a=4b 5 16=4b  5 16=4 b  4b=80  b=480=20  b=20  n=a+b=16+20=36

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