8. 1 bottle of shampoo and 1 bottle of bath foam cost $15.50 altogether. Mrs Yeo bought 3 bottles of shampoo and 5 bottles of bath foam for $59.70. How much did one bottle of bath foam cost?
1 S + 1 F --> $15.50
3 S + 5 F --> $59.70
3 S + 3 F --> 3 x 15.50 = 46.50
2 F à 59.70 – 46.50 = 13.20
1 F -- > 13.20 ÷ 2 = $6.60
One bottle of bath foam cost $6.60.
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