Math Riddles

Question: Which is the missing number in the below Number Series? 2, 3, 5, 7, 11, 13, ?, 19

Question: How is 2+2 four, 3+3 eight, and 7+7 triangle?

Question: 1. A bat and a ball cast $1.10 cents in total. The bat costs one dollar more than the ball. How much does the ball cost? 2. If five machines made five gadgets in five minutes, how much time would it take for 100 machines to make 100 gadgets? 3. The was a lake, it was full with lily pads, each day the lily pads doubled in size, it took 48 days for the lily pads to cover all of the lake how long would it take for the lily pads to cover half of the lake?

Question: In 1940, a correspondent proposed the following question:

A man's age at death was one twenty-ninth of the year of his birth. How old was he in 1900?

Question: If you are smart and very good at math. Answer these 2 math riddles. 1. What is 0x29840847894657867478465875674896478496478567968. 2. 1x89498784893246798648732742974823.