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Primary 4 | Maths
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5 burgers + 10 drinks cost $30
1 burger + 2 drinks cost $6
Cost of 1 packet of fries is equivalent to the cost of 2 cups of drinks, therefore, 1 cup of drink is $1.
1 burger, 1 packet of fries, 1 cup of drink cost $(6 + 1) = $7