读一读，答一答。
1．At a birthday party, half the guests drink cola, a quarter of the guests have lemonade, one sixth have orange juice, and the remaining three have water. How many guests are there at the party?
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2．Mike is 3 cm taller than Peter, but 2 cm shorter than Ann. Ann is 168 cm tall. How tall is Peter?
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3．Susan often goes to bed at 8:15 in the evening. This is 15 minutes before her brother Harry and half an hour after her sister May. Her cousin Bob is often in bed an hour before Harry. Who goes to bed first?
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