Respuesta :

The ratio of boys to girls is 5 : 6 
total number of girls = 312
Let total number of boys= x
so,   5 / 6 = x / 312
x = ( 312 * 5 ) / 6
x = 260 boys Ans 

A ratio shows us the number of times a number contains another number. The number of boys in the 9th grade is 260.

What is a Ratio?

A ratio shows us the number of times a number contains another number.

Given that the ratio of boys to girls in the 9th grade is 5 to 6. Therefore, we can write the ratio as,

Ratio =Boys/Girls = 5/6

Now, as it is given that there are 312 girls. Therefore, using the ratio of the number of boys in the class is,

Boys/Girls = 5/6

Boys/312 = 5/6

Boys = (312×5)/6

Boys = 260

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