Alex Y
As mnay of you wlil be aarwe, to raed a txet the oedrr in wihch the lrtetes of ecah idniadiuvl wrod aepapr is not ipmotanrt, so lnog as the fsrit and lsat ltetres are crorect. Tihs is ovboisuly not the csae wtih nmuebrs beacsue if one slcarbmes the iretnnal ditgis of a nmbeur, it is not pissolbe to wrok out waht the ogirianl nemubr was. Go fugrie.

Tehre are, hwoveer, cirtaen cesas in wchih tehre is sufuficnet inmoartfion to fnid out the onriiagl neumbrs, scuh as in the sum bolew. The itenarnl diigts of ecah of the nmbeurs hvae been srcmalbed but the fsrit and lsat dgitis rmaein the smae.

Can you rseotre the oigrianl atdiiodn and its sum?

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Devised by Bernardo Recamán, as reported by Alex Belos in The Guardian