It takes 10 days for digging a trench of 100 m long, 50 m broad and 10 m deep. What length of trench,
25 m broad and 15 m deep can be dug in 30 days ?	Choose the correct choice from the following choices: A) 400 m B) 200 m C) 100 m D) 89 m E) 79 m

Rationale: more days , more length ( direct ) less breadth , more length ( indirect ) more depth , less length ( indirect days 10 : 30 ; breadth 25 : 50 ; : : 100 : x depth 15 : 10 ; : . 10 * 25 * 15 * x = 30 * 50 * 10 * 100 x = ( 30 * 50 * 10 * 100 ) / 10 * 25 * 15 = 400 so the required length = 400 m answer : a
Answer: A