Question

Omar has a new debit card. He earns 1,800 reward points for spending 300 dollars. At this rate, if Omar earned 600 reward points, how much money did he spend?

Answer 1

Omar spent $100 to earn 600 reward points.

Explanation:

The reward points are proportional to the money spent.

Thus, we can determine the amount of money Omar spent to earn 600 reward points by creating two proportions where a refers to the amount of money spent:

1800 reward points / $300 spent = 600 reward points / $a spent

1800/300 = 600/a

(6 = 600/a) * a

(6a = 600) / 6

a = 100

Thus, Omar spent $100 to earn 600 reward points.