7. Mrs Smith bought some mangoes and mangosteens for $16.50. She bought 5 fewer mangoes than mangosteens. Each mango cost $1.80 more than each mangosteen. How many mangosteens did she buy?
Mangoes Mangosteens
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1 6
16.50 – 1.80 = 14.70
14.70 ÷ 7 = 2.10
Check
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1 x (2.10 + 1.80) + 6 x 2.10 = $16.50
He bought 6 mangosteens.
5 10
5 x 1.80 = 9
16.50 – 9 = 7.50
7.50 ÷ 15 = 0.50
Check
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5 x (0.50 + 1.80) + 10 x 0.50 = $16.50
He bought 10 mangosteens.
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