Calvin the Cat man

Calvin has 3 cats. The oldest cat Heathcliff is 16 years old. The mean age of the cats is 10. The median age of the cats is 8. What is the age of the youngest cat?

Possible Test Scores for a grade of B

You are taking a Math class, where your grade is determined by your performance in 5 tests. The maximum score on each test is 100. Your first 4 test scores have been 63,80,90 and 85. To receive a B in the class, the average of the five test scores must be greater than or equal to 80 and strictly smaller than 90. If only integer test scores are allowed, how many different test scores could you receive for the last test and get a grade of B?

Trip Expenses

A group of friends are planning a road trip. If they all contribute $24, then they would be $6 short of the total cost of the trip. If they all contribute $25, then they would have $3 more than the total cost of the trip. What is the total cost of the trip?

Pity the frog

A frog is stuck at the bottom of a man-made well which is 21 feet deep. Each day, the frog is able to climb up 5 feet. However, each night, the frog slides down 3 feet. On which day would the frog be able to escape this well?

Find that remainder!

What is the remainder when 4321 is divided by 321?

Reciprocal Sum Equality

If a and b are coprime positive integers such that

12+13+14+15=ab,

what is the value of a+b?

Nancy's Closet Staff discount

With the holiday approaching, Nancy's Closet is having a sale, where all their clothes are 40% off. Mary, who works there, can get a further staff discount of 40% off the sale price. What is the total percent discount that Mary gets?