Question
One watermelon cost 3 times as much as one persimmon. Mrs Zhang bought 2 watermelons and 4 persimmons for $16.80. How much would 7 watermelons and 5 persimmons cost? Express the answers to 2 decimal places.
3 m

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One watermelon cost 3 times as much as one persimmon. Mrs Zhang bought 2 watermelons and 4 persimmons for $16.80. How much would 7 watermelons and 5 persimmons cost? Express the answers to 2 decimal places.