12
$\begingroup$

Uh... Every letter corresponds to a different digit and 0 cannot be a leading digit. Find $HA+UH$ if $$\begin{array}{cccc} & H & A \\ + & H & A \\ + & H & A \\ + & H & A \\ \hline & U & H \\ \end{array}$$

$\endgroup$

1 Answer 1

15
$\begingroup$

Uh, 4 Hs add up to a single digit so H is 1 or 2. But four As add up to something with H as the low digit so H is not 1 (must be even). So H is 2. Then the only thing A could be is 3 or 8. If it were 8 then 4x8=32 and we carry 3. 4x2+3 = 11, more than a single digit. So A must be 3. 4x3=12 so we carry one to the tens column. U = 4x2+1 = 9. So HA + UH = 23 + 92 = 115. Ha ha.

$\endgroup$
5
  • 3
    $\begingroup$ I got the same answer, but don't get how it connects to "laughing" in the title, and why you wrote haha at the end $\endgroup$
    – nuggethead
    Apr 22, 2023 at 16:04
  • 2
    $\begingroup$ @nuggethead uh, the addends are HA (laughing) and the sum is UH (i guess this indicates it's the wrong time to laugh) ha ha. $\endgroup$
    – caPNCApn
    Apr 22, 2023 at 16:09
  • 1
    $\begingroup$ But does the sum at the end have any significance? $\endgroup$
    – nuggethead
    Apr 22, 2023 at 16:14
  • 1
    $\begingroup$ No, it doesn't. $\endgroup$ Apr 22, 2023 at 16:49
  • 1
    $\begingroup$ But according to Wikipedia: 115 is also a heptagonal pyramidal number. The 115th Woodall number, $2^{115}-1=4\;776\;913\;109\;852\;041\;418\;248\;056\;622\;882\;488\;319$, is a prime number. $\endgroup$ Apr 22, 2023 at 18:17

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.