Question

In a game, Ted has to earn coins. If he gets a gold coin, he gains 20 points, but if by mistake he gets a red coin, he loses 5 points. What is his total score if he gets 19 gold coins and 7 red coins?

Answer 1

$\text{Points gained for each gold coin =}20$

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

$\text{Similarly, for each red coin, points lost}=5$
$\text{Implies, points gained for each red}\text{coin =}-5$

$\text{Points gained for 7 red coins}=(-5)\times 7$

$\text{So, Ted's score:}=(19\times 20)+\left(\right(-5)\times 7)$
$=380+\left(\right(-5)\times 7)$
$=380+(-35)=380-35$
$=345$