18. Elsie had $320 less than Grace. Elsie gave Grace $170. Now the ratio of Elsie’s money to Grace’s money is 3 : 5. How much money did Elsie have at first?
E [ ][ ][ ][170]
G [ ][ ][ ][ ][ ]
[ ][ ][ ][170][320][170]
2 u -- > 170 + 320 + 170 = 660
1 u -- > 660 ÷ 2 = 330
3 u -- > 3 x 330 = 990
990 + 170 = $1160
Elsie had $1160 at first.
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