Question
One watermelon cost 2 times as much as one persimmon. Mrs Zhang bought 4 watermelons and 2 persimmons for $10.40. 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 2 times as much as one persimmon. Mrs Zhang bought 4 watermelons and 2 persimmons for $10.40. How much would 7 watermelons and 5 persimmons cost? Express the answers to 2 decimal places.