Question

Mike has some coins in his pocket consisting of dimes, nickels, and pennies. He has two more nickels than dimes, and three times as many pennies as nickels. How many of each kind of coins does he have if the value is 52 cents? What is the variable and equation?

Answer 1

let n be there number of nickels, p be there number of pennies, and d be the number of times. the total value is

p+5n+10d=52
n=d+2
p=3n
p=3d+6

3d+6+5d+10+10d=52
18d+16=52
18d=36
d=2
n=d+2=4
p=3n=12

12 pennies+4 nickels+2 dimes is 52 cents