Math

There are 10 bags full of coins out of which one bag is full of fake coins which we don’t know. But you do know that genuine coins weigh 01 gram, but fake weighs 1.1 grams. We have to identify that bag in minimum readings a digital weighing machine.
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A man asked his neighbour’s son age. He replied in a mathematical way. My son is five times as old as my daughter and my wife is five times as old as my son. I am twice as old as my wife whereas my grandmother, who is celebrating her eightyfirst birthday is as old as all of us put together.
How old is the man’s son?
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Can you write down eight eights so that they add up to one thousand?
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How many cases do you need if you have to pack 112 pairs of shoes into cases that each hold 28 shoes?
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I am six letters. When you take one away I am twelve.
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In a party of 35 people, there are twice as many women as children and twice as many children as men.
How many of each are there?
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