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A stack of boards is 21 inches high. Each board is 1 3/2 inches thick. How many boards are there?

Sagot :

If the stack is 21ins and each board is 1 3/2 ins thick that means you 21/(1 3/2) so you end up getting 8.4. Because you can't have a part of a board you round the number down to 8 boards. 
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