Answer:
160 children, 112 boys and 48 girls.
Explanation:
You can translate this into two equations:
g = 3/7 * b
g+64 = b
Then fill in one in the other and simplify:
3/7 b + 64 = b =>
4/7 b = 64
b = 64 * 7/4 = 112
g = 112 * 3/7 = 48
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