Calvin has a total of 60 pieces of $5 and $10 notes. After using 1/4 of his $5 notes and 4 $10-notes to buy a bag, he has an equal number of $5 and $10 notes left. How much money does he have at first?
+36915 x = 5 dollar notes (60 -x ) = 10 dollar notes
then
x - 1/4 x = (60-x) -4 Solve for x
3/4x = 56-x
1 3/4x = 60
x = 5 dollar notes = 34 the reaminder are 10 dollar notes 26
value : 5 * 34 + 26 * 10 = ______________ dollars initially
