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Math Riddles: 1. A bat and a ball cost $1.10 in total. The bat cost $1.00 more than the ball. How much does the ball cost? 2. If 7 people meet each other and shakes hands only one with each of the others, how many handshakes will there have been? 3. There is a three-digit number. The second is four times as big as the third number, while the first is three less than the second digit. What is the number? | Philippine Review Center