3 quarters (75 cents) 1 dime (10 cents) 2 pennies (2 cents) 75+10+2=87 | 6 coins
Or, with half dollar coins:
1 half dollar coin (50 cents) 1 quarter (25 cents) 1 dime (10 cents) 2 pennies (2 cents) 50+25+10+2=87 | 5 coins
The United States is one of three nations (along with Liberia and Burma) that have not adopted the metric system as their official system of weights and measures. U.S. customary units are widely used on consumer products and in industrial manufacturing.
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