Kayjay1999 Kayjay1999

12-07-2016
Mathematics

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A person has 17 coins, all nickels and dimes, worth $1.25. How many nickels are there?

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Аноним Аноним

12-07-2016

9 Nickels, 8 Dimes...here is how i work it out!

d + n = 17
0.1d + 0.05n = 1.25

d = 17 - n
0.1 (17 - n) + 0.05n = 1.25
1.7 - 0.1n + 0.05n = 1.25
1.7 - 0.05n = 1.25
-0.05n = -0.45
n = 9

9 Nickels, 8 Dimes

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