Solution 1:
Let x be the number of boys.
Then, the number of girls is (x + 3), therefore,
boys + girls = 515
x + (x + 3) = 515
2x + 3 = 515
2x = 515 - 3
2x = 512
x = 256
x + 3 = 259
Ans. 256 boys, 259 girls
Solution 2:
Let x be the number of girls.
Then, the number of boys is (x - 3), therefore,
(x - 3) + x = 515
2x - 3 = 515
2x = 515 + 3
2x = 518
x = 259
259 - 3 = 256
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Answers & Comments
Solution 1:
Let x be the number of boys.
Then, the number of girls is (x + 3), therefore,
boys + girls = 515
x + (x + 3) = 515
2x + 3 = 515
2x = 515 - 3
2x = 512
x = 256
x + 3 = 259
Ans. 256 boys, 259 girls
Solution 2:
Let x be the number of girls.
Then, the number of boys is (x - 3), therefore,
boys + girls = 515
(x - 3) + x = 515
2x - 3 = 515
2x = 515 + 3
2x = 518
x = 259
259 - 3 = 256
Ans. 256 boys, 259 girls