SOLUTION: If the difference between one-third of a number and one-seventh of that same number is 8, then what is the number? (A) 12 (B) 21 (C) 30 (D) 42 (E) 56

Question 324914: If the difference between one-third of a number and one-seventh of that same number is 8, then what is the number?
(A) 12 (B) 21 (C) 30 (D) 42 (E) 56

Answer by vleith(2983) (Show Source): You can put this solution on YOUR website!
Let x be the number. You are told
find a common denominator. Since 3 and 7 are relatively prime (and also really prime), that demoninator is 3*7 = 21

Check your answer
what is the difference between 42/3 = 14 and 42/7 = 6 equal 8??

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