self Maths Puzzle

A jar contains 3 coins. 2 are heads and tails. 1 is heads and heads.
You pick out at coin and toss it 3 times. You get three heads.
Question ; What is the probability of getting a head on the fourth toss ?

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self Other Question

If a and b are positive integers, and x=2×3×7×a , and y=2×2×8×b , and the values of both x and y lie between 120 and 130 (not including the two), then a–b? Three people picked 65 apples altogether. At the first tree they each picked the same number of apples. At the second tree they each picked 3 times as many as they picked at the first tree. When they finished at the third tree, the group had 5 times as many apples as they had when they started at that tree. At the fourth tree the group picked just 5 apples. How many apples did each person pick at the first tree?