In which direction should the missing arrow point?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

What has no start, end, or centre?

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?

A brand new Mobile Phone was on sale at 20% as a promotional offer. By what per cent must the Mobile price be increased to sell it at the original price again?

A bag contains 64 balls of eight different colours. There are eight of each colour (including red). What is the least number you would have to pick, without looking, to be sure of selecting 3 red balls?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

What word does this rebus represent?

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Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

Complete the table series riddle by finding the number that can replace "??".