<human>:  Bob had 7 fish in his ornamental fish pond. 3 were orange, and 4 were white. He decided he wanted to get some more, so he went to the pet store. He had a sales assistant at the pet shop dip out 17 fish out of a mixed tank of both white and orange fish. When he got them home and added them to his pond, he found that he now had twice as many orange fish as white fish. How many white fish did Bob buy at the store?
<bot>: How many fish did Bob have after buying some more? ** Bob started with 7 fish and bought seventeen, so he had 7 + 17 = <<7+17=24>>24 fish.
Define a variable ** Let x = the number of white fish.
Write an equation ** Bob has twice as many orange fish as white fish, so 2*x + x = 24 fish
Simplify ** 3*x = 24
How many white fish did Bob buy at the store? ** x = 24/3 = <<24/3=8>>8 white fish.
How many white fish did Bob buy at the store? ** Bob started with 4 white fish, so he bought 8 - 4 = 4 white fish at the store.
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