Nova Press: Set C - Substitution (Plugging In)
Question Name Average time to answer (seconds) Total correct answers Total incorrect answers
The ten’s digit of a two-digit number is twice the unit’s digit.  ... ... 87 64 23
If , then N = 38 74 4
Suppose half the people on a bus exit at each stop and no additional passengers ... ... 114 46 30
The sum of the digits of a two-digit number is 12, and the ten’s digit ... ... 52 63 14
If , then x could be 105 61 15
Which one of the following is a solution to the equation  ? 45 78 4
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