You could round 77 to 80 and 65 to 70 and then add 70 and 80 and you will get 150
2x + x = 60 that is your equation. Simplify it and you get 3x = 60. 60/3 equals 20 so you have 20 boys but multiply it by 2 since you have twice as many girls and you get 40 girls total.
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the second option
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Answer:7796
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