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number theory junior
Problem
There are many two-digit multiples of 7, but only two of the multiples have a digit sum of 10. The sum of these two multiples of 7 is
(A)
(B)
(C)
(D)
Solution
Writing out all two digit numbers that have a digital sum of , you get and . The two numbers on that list that are divisible by are and . Their sum is , choice .
Final answer
A