Two terms are in 3 : 4, if 10 is added to each of the terms, they will be 4 : 5. Find second term?  Choose the correct choice from the following choices
A) 10 B) 30 C) 20 D) 40 E) 35

Rationale: solution : let the two numbers be 3 x and 4 x . then , ( 3 x + 10 ) / ( 4 x + 10 ) = 4 / 5 . = > 15 x + 50 = 16 x + 40 = > x = 10 . . ' . second term = 4 * 10 = 40 . answer is d
Answer: D