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UPSKILL MATH PLUS

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1. CBQ - Science lab equipment

4 m.

A science teacher buys $x$ boxes of wires costing $₹24$ each 9 batteries costing $₹20$ each. A student writes the total cost as:

$24x + 9 + 20$

1. Identify the mistake in the expression.

2. The correct algebraic expression is

3. If $x = 3$, then the total cost is

4. Verify your answer by direct calculation.

Cost of wires $= 24(3) = 72$ Cost of batteries $= 9 + 20$ $= 29$ Total cost $= ₹72 + 29$ $= ₹101$
Cost of wires $= 24(3) = 72$ Cost of batteries $= 9 \times 20$ $= 180$ Total cost $= ₹72 - 180$ $= ₹-108$
Cost of wires $= 9 \times 20 \times 3$ $= 540$ Cost of batteries $= 24$ Total cost $= ₹540 + 24$ $= ₹564$
Cost of wires $= 24(3) = 72$ Cost of batteries $= 9 \times 20$ $= 180$ Total cost $= ₹72 + 180$ $= ₹252$

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