At a local market you can trade 4 apples for n oranges. Equivalently, you can trade n+2 apples for 12 oranges. How many oranges can you obtain with 12 apples

Answer 1

4a = no 4 apples trade for n oranges

12o = n+2

n+2 apples trade for 12 oranges

12a = ??? how many oranges can you get for 12 apples

12a = 3x 4a = 3no. 12 apples get you 3n oranges

but that 2nd line says

12o = n+2

12o = 4(3n) where n=1 so 1+2 apples = 3 apples for 12 oranges

which means 12 apples get you 48 oranges

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