Sand Buying

A large sack of sand is $3.25 for 50 pounds; a small sack is $2.29 for 30 pounds. You need 170 pounds of sand. What’s the cheapest way to buy it?

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The cheapest way to buy 170 lb of sand is actually to buy 180 lb in three 50-lb sacks and one 30-lb sack:

3 x 50 + 30 costs 3 x 3.25 + 2.29 = $12.04.

You can always find something to do with an extra ten pounds of sand.

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