A number whose fifth part increased by 7 is equal to its fourth part diminished by 7 is ?	Choose the correct choice from the following.
A) 160 B) 180 C) 200 D) 280 E) none

Rationale: "answer let the number be n . then , ( n / 5 ) + 7 = ( n / 4 ) - 7 â ‡ ’ ( n / 4 ) - ( n / 5 ) = 14 â ‡ ’ ( 5 n - 4 n ) / 20 = 14 â ˆ ´ n = 280 option : d"
Answer: D