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Multiples

What is the v...

Question

What is the value of the following expression?
$20 \times 19 + (- 5) \times 7$

A

345

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B

335

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C

355

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D

235

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Solution

The correct option is A 345
$20 \times 19 = 380$

If the number of negative integers in a product is odd, then the product is a negative integer.
$∴ (- 5) \times 7 = - (5 \times 7) = - 35$

$∴ 20 \times 19 + (- 5) \times 7 = 380 + (- 35) = 345$

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