Ann has some dimes and quarters. If she has 13 coins worth a total of $2.50, how many of each type of coin does she have?

Question

I really really need this answer

 

Answer 1

Make a chart; dimes + quarters must be 13, and total value must be $2.50

 

dimes [value]   quarters[value]     total coins [total value]

   10   [1.00]         3 [0.75]            13  [ 1.75 ]

   9     [0.90]         4 [1.00]            13 [ 1.90 ]

   8     [0.80]         5 [1.25]            13 [ 2.05 ]

   7     [0.70]         6 [1.50]            13 [ 2.20 ]

   6     [0.60]         7 [1.75]            13 [ 2.35 ]

   5     [0.50]         8 [2.00]            13 [ 2.50 ]

 

So there are 5 dimes and 8 quarters.