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1.45 is a number. If you mean a whole number, then as the first digit after the decimal point is a 4, it will be rounded down to give 1 as your answer.
-- Write down the number of kwh -- Write down the number of square feet -- Divide the first number by the second number. -- The answer is mathematically correct, but doesn't appear to have any physical significance in the real world.
1 since first number after decimal is less than 5, round down to 1
There is only one combination possible. If you went through every possible permutation, you would have 6! = 6*5*4*3*2*1 = 720 to try. However, if, for example, the third key worked on the first lock I hope you would not try the fourth, fifth and sixth keys on the first lock. So he total number of attempts will be much smaller. Bearing that in mind 16 attempts is the maximum you would need.
Look at the first digit after the decimal point. It is a 1, so the number will be rounded down. So that leaves 56 as the answer.