Discussion
A two-digit number is seven times its units digit. The number is:
Answer: D
Write the number as \(10t + u = 7u\), which gives \(10t = 6u\) and so \(5t = 3u\). The only single digits that fit are \(t = 3\) and \(u = 5\), giving 35. Check: \(7 \times 5 = 35\). Testing each option against its own units digit is just as quick here.
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