Question 74

Simplify: $$23 \times 2(45 - 15) + 168 \div 4 \div 2 - (11)^2$$

Solution

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$$23\times2(45-15)+168\div4\div2-(11)^2.$$

$$=23\times2\times30+168\div4\div2-121.$$

$$=23\times2\times30+168\div8-121.$$

$$=23\times2\times30+21-121.$$

$$=1401-121.$$

$$=1280.$$

A is correct choice.

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