Hokkien Huay Kuan Combined Primary 2010 PSLE Math Prelim Paper 2 Q5

At a bakery, muffins are sold at $1 each. When a customer buys 5 muffins, she can buy one more at half the price. What is the greatest number of muffins that a customer can buy with $20?

Solution

6 muffins ----- $5.50 (Five at $1; One at $0.50)

3 groups of $5.50 ----- 6 muffins x 3 = 18 muffins

(3 x $5.50 = $16.50) ----- 18 muffins

$20 - $16.50 = $3.50 (remaining)

With the remaining $3.50, the customer can buy another three muffins at $1 each.

Total muffins ----- 18 + 3 = 21

Answer: 21 muffins

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