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 most appropriate option:	A) 400 m	B) 200 m	C) 100 m	D) 89 m	E) 79 m
<gadget id="calculator">30 * 50</gadget>
<output>1_500</output>

<gadget id="calculator">1_500 * 10</gadget>
<output>15_000</output>

<gadget id="calculator">15_000 * 100</gadget>
<output>1_500_000</output>

<gadget id="calculator">10 * 25</gadget>
<output>250</output>

<gadget id="calculator">15 * 250</gadget>
<output>3_750</output>

<gadget id="calculator">1_500_000 / 3_750</gadget>
<output>400</output>

<result>A</result>
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?
divide(multiply(multiply(multiply(30, 50), 10), 100), multiply(15, multiply(10, 25)))
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