A can do a piece of work in 14 days, while B can do in 21 days. They begin together. But, 3 days
before the completion of the work, A leaves off. Find the total number of days taken to complete
the work.
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A friend asked you for advice about what to eat before an important examination. In 80 to 100 word, write a letter to give advice to him/her about proper eating
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