HOTS Mathematics Primary 6 Algebra

The expression 4n − 3 represents the total amount, in dollars, earned at a school bookshop sale. Which of the following situations is correctly described by 4n − 3?

A n items sold at $4 each, with $3 added as a handling fee
B n items sold at $4 each, after a $3 discount coupon is deducted from the total
C 4 items sold at $n each, after a $3 discount coupon is deducted
D n items sold at $3 each, with $4 added as a handling fee
Show Worked Solution

Worked Solution

Step 1: Read the expression 4n − 3 term by term. 4n means "4 multiplied by n". This represents a unit rate of $4 per item × n items. Step 2: Interpret the − 3. Subtracting 3 means a fixed amount of $3 is taken away from the total — this is a deduction or discount. Step 3: Match to the correct situation. "n items at $4 each" → total before discount = 4n. Deducting a $3 coupon → 4n − 3. The correct situation: n items sold at $4 each, after a $3 discount coupon is deducted from the total.

Correct answer: n items sold at $4 each, after a $3 discount coupon is deducted from the total

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