Two-digit 7818

Find the sum of all two-digit numbers in which the digits differ by 7.

Correct answer:

s =  290

Step-by-step explanation:

a1=18 a2=29 a3=81 a4=92 a5=70  s=a1+a2+a3+a4+a5=18+29+81+92+70=290



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