book Maths Puzzle Numerical Ability

"W-e Aaron,Brian and clyde- each have some children."

1. Aaron has at least one girl and twice as many boys as girls.
2. Brian has at least one girl and three times as many boy

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book Other Question

write as single logarithm:
4 logb x + 4 logb y
solve:

20 over x = 20 over x-4 + 4 over x

show work