+ AT + THE + OT HER + T EN ▁= TEST S ▁ ▁( The ▁answer ▁is ▁that ▁TR AN H YS MO E = 9 8 7 6 5 4 3 2 1 0 .) ▁ ▁See ▁also ▁ ▁Di oph antine ▁equation ▁ ▁Mathemat ical ▁puzz les ▁ ▁Perm ut ation ▁ ▁P uzz les ▁ ▁Side ways ▁Ar ithmetic ▁From ▁W ays ide ▁School ▁- ▁A ▁book ▁whose ▁plot ▁revol ves ▁around ▁these ▁puzz les ▁ ▁References ▁▁ ▁Martin ▁Gard ner , ▁Mathemat ics , ▁Magic , ▁and ▁Myst ery . ▁D over ▁( 1 9 5 6 ) ▁ ▁Journal ▁of ▁Rec re ational ▁Mathemat ics , ▁had ▁a ▁regular ▁al ph am et ics ▁column . ▁ ▁Jack ▁van ▁der ▁El sen , ▁Al ph am et ics . ▁Ma astr icht ▁( 1 9 9 8 ) ▁ ▁K ah an ▁S ., ▁Have ▁some ▁sums ▁to ▁solve : ▁The ▁complete ▁al ph am et ics ▁book , ▁Bay wood ▁Publishing , ▁( 1 9 7 8 ) ▁ ▁Bro oke ▁M . ▁One ▁H undred ▁& ▁Fif ty ▁P uzz les ▁in ▁C rypt - Ar ithmetic . ▁New ▁York : ▁D over , ▁( 1 9 6 3 ) ▁ ▁H ites h ▁T ik am ch and ▁J ain , ▁ABC ▁of ▁C rypt ar ithmetic / Al ph am et ics . ▁India ( 2 0 1 7 ) ▁ ▁External ▁links ▁Solution ▁using ▁Mat lab ▁code ▁and ▁tutorial ▁ ▁C rypt