Question

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

• A. 345
• B. 335
• C. 355
• D. 235

Answer 1

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.
$\therefore (-5)\times 7=-(5\times 7)=-35$

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