Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

What work can one never finish?

Can you make four (4) nines (9) equal 100?

I always drive my customer away.

Who am I?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

I hide my treasure in the ground, my tail is big and fluffy. If you spot me in a tree, please don’t call me scruffy. What am I?

What is the value of 1/2 of 2/3 of 3/4 of 4/5 of 5/6 of 6/7 of 7/8 of 8/9 of 9/10 of 1000?

Can you complete the sequence?

192, 021, 222, 324, 252, 627, 2__, 9__?

What's a single-digit number with no value?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?