Risa had a sum of money. She spent an equal amount of money daily. At the end of the ninth day, she was left with
310 of her money. At the end of the eleventh day, she was left with $117. How much money did she have at first?
Fraction of amount of money spent in 9 days
= 1 -
310 =
710 Fraction of amount of money spent in 1 day
=
710 ÷ 9
=
710 x
19 =
790 Fraction of amount of money spent in 11 days
= 11 x 790
=
7790 Fraction of amount left after 11 days
= 1 -
7790=
139013 u = 117
1 u = 117 ÷ 13 = 9
Total amount that Risa had at first
= 90 u
= 90 x 9
= $810
Answer(s) $810