Question

Parker is selling masks. On the start of the day, he has 100 masks. He sells 9 masks every hour. How many masks will be left with him after 5 hours?

• A. 55
• B. 45
• C. 50
• D. 40

Answer 1

The correct option is A 55

Parker has 100 masks.
For the first hour, he sells 9 masks.

For the second hour, he sells 9 more masks; totally, 18 would be sold.

For the third hour, he sells 9 more masks; totally, 27 would be sold.

The pattern is 9, 18, 27.

The next terms are 36, 45.

After 5 hours, 45 masks would be sold.

Total masks at the beginning = 100

Hence, the remaining masks after 5 hours = 100 - 45 = 55

Hence, 55 masks will be left with him after 5 hours.