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A packet holds 24 chalk sticks and a teacher uses c of them in one week. Which choice gives the expression for the chalk sticks left AND its value when c = 9?

Class 6AlgebraAlgebra
  • A; 216
  • Bc − 24; 15
  • C24 + c; 33
  • D24 − c; 15

Step-by-Step Solution

Start at 24 and remove c, giving 24 − c; with c = 9 that is 24 − 9 = 15. The option c − 24 reverses the subtraction — it would say 9 − 24, which is not the number of sticks left — even though it happens to quote the right value.
Answer: D) 24 − c; 15

Key idea: Evaluating an expression

To evaluate an expression, **substitute** a value for the variable and compute. If , then becomes . The same expression with gives . Practise substituting — it is the bridge between an algebraic expression and a real number.

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