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const2013 [10]
3 years ago
7

Carly has 20 coins of pennies and dimes. The value totals $0.92.How many of each coin is there?

Mathematics
2 answers:
Virty [35]3 years ago
5 0

9514 1404 393

Answer:

  • Pennies: 12
  • Dimes: 8

Step-by-step explanation:

The number of pennies will be 2 more than a multiple of 10. 2 pennies and 9 dimes is not enough coins. 12 pennies and 8 dimes is exactly enough.

__

This one is easy to figure by "trial and error," as there is only one trial that makes any sense.

If you want to figure it using an equation, it usually works well to let a variable represent the quantity of the<em> higher-value</em> coin. If d is the number of dimes, then 20-d is the number of pennies. The total number of cents is ...

  10d +(20-d) = 92

  9d = 72 . . . . . . . . . subtract 20

  d = 8

  20-d = 12

There are 8 dimes and 12 pennies.

kaheart [24]3 years ago
4 0
90 dimes nd 2 pennies
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