Others Maths Puzzle

There is one 40 kg weight stone.How many weights are there such that it can measure any weight between 1 to 40 kg?

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Others Other Question

A can do a price of work in 40 days. He worked at it for 5 days. Then B alone finished it in 21 days. The number of days that A and B together take to finish the work is.
(1) 15 (2) 14 (3) 13 (4) 10
the tree grows first day 1/2 of its original size,grows 1/3 of its prevous day size,and grows 1/4 and so on.How many days it will take to grow 100 times to the original size of tree?