Question

In a video game, you have to earn coins. If you get a gold coin, you gain 20 points, but if by mistake you get hold of a red coin, you lose 5 points. Suppose you got 19 gold coins and 7 red coins, what’s your total score?

• A. 325
• B. 335
• C. 345
• D. 355

Answer 1

The correct option is C

345

For each gold coin, no. of points gained
$=20$

So, for 19 gold coins, points gained
$=20\times 19$

Similarly, for each red coin, points lost
$=5$

Or, for each red coin, points gained
$=-5$

So, for 7 red coins, points gained
$=(-5)\times 7$

So, your score
$=(19\times 20)+\left(\right(-5)\times 7)$
$=380+\left(\right(-5)\times 7)$
$=380+(-35)=380-35$
$=345$