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A number is larger than half of 80. It is more than 4 tens and less than 6 tens. The sum of its digits is 6. Its tens digit is double the ones digit. What is the number?
Correct Answer: D — 42
Explanation:
Calculations: Following choices are: 46, 51, 60, 42 1) 46 - The sum of digits is 10, not 6, so it can't be this. 2) 51 - The tens digit isn't double the ones digit, so it can't be this. 3) 60 - This exceeds the upper limit of less than 6 tens, so it can't be this.