Question

The ratio of girls to boys at a party is 5:4. if there are 20 girls in the class, how many boys are there.

Answer 1

• 16 boys

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Let the number of boys be b and girls be g.

The ratio is:

• g/b = 5/4

And the number of girls is:

• g = 20

Substitute the number into ratio and find the value of b:

• 20/b = 5/4
• b = 20*4/5
• b = 16