Question

in a change jar, tom has nickels and dimes. the number of nickels is two times the number of dimes and the total amount of money in the jar is $1.20. how many dimes are in the jar? a) 6 b)12 c)10 d)24

Answer 1

N=number of nickles
d=number of dimes

n is 2 times d
n=2d
total money is 1.20
convert to cens
120 cetns

5n+10d=120
n=2d
5(2d)+10d=120
10d+10d=120
20d=120
divide both sides by 120
d=6
6 dimes is answer

answer is A, 6 dimes