Peggy had three times as many quarters as nickels. she had $1.60 in all. how many nickels and how many quarters did she have?
which of the following equations could be used to solve the problem?

a.) n + 3n = 1.60
b.) n + 3n = 160
c.) 5n + 75n = 1.60
d.) 5n + 75n = 160

0.05n + 0.25q = 1.60
q = 3n

0.05n + 0.25(3n) = 160
0.05n + 0.75n = 1.60...multiply by 100 to get rid of the decimals
5n + 75n = 160...answer D

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.