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A jar contains only​ pennies, nickels,​ dimes, and quarters. There are 16 ​pennies, 11 ​dimes, and 20 quarters. The rest of the coins are nickels. There are 74 coins in all. How many of the coins are not​ nickels? If n represents the number of nickels in the​ jar, what equation could you use to find​ n?

Sagot :

Answer:  23n (nickels)

16p + 11d + 20q = 47x

x = number of coins that aren't nickels

y = number of coins in all

n = nickels

so there are 74 coins in all

70y - 47x = 23n

there are 23 nickels

lets check: 23n + 16p + 11d + 20q = 70y

 

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