Answer:
324 boys
Explanation:
Add the ratio, 4+ 5 = 9 and divide 720 with nine. Then multiply that value, 81, with 4 to find the number of boys, and multiply with 5 to get the girls
There are 320 boys
boys: girls : total
4 5 4+5 = 9
Take the total and divide by 9
720/9 = 80
Multiply each term by 80
4*80 5*80 9*80
320 400 720
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