1. Last month, Mr. Anderson spent 8% of his salary to pay his electricity bill, 12% to pay his phone bill, and 50% for general monthly expenses. If his salary is $ 3900, then his savings last month was   $ 2730   $ 312   $ 1170   $ 468   $ 1950   Hint Half-n-half Clue   2. If a and b are both odd numbers, then which of the following must be an odd number ?   ab + 1   a + b   ab   a + b + 2   2a + b + 1   Half-n-half Clue   3. The arithmetic mean of 6, 12, and n is 22. What is the value of n?   22   cannot be determined   18   48   40   Half-n-half Clue   4. If a is an odd number and b is an even number, then which of the following must be an even number ?   a + b + 2   2a + b   a + b   ab + 1   2b + a   Half-n-half Clue