if 20 men can build a water fountain 56 metres long in 3 days, what length of a similar water fountain can be built by 35 men in 3 days? Select the correct option
A) 40 m	B) 64 m	C) 77 m	D) 89 m	E) 98 m
<gadget id="calculator">20 * 3</gadget>
<output>60</output>

<gadget id="calculator">56 / 60</gadget>
<output>14/15 = around 0.933333</output>

<gadget id="calculator">35 * 3</gadget>
<output>105</output>

<gadget id="calculator">(14/15) * 105</gadget>
<output>98</output>

<result>E</result>
if 20 men can build a water fountain 56 metres long in 3 days, what length of a similar water fountain can be built by 35 men in 3 days?
multiply(divide(56, multiply(20, 3)), multiply(35, 3))
"explanation : let the required length be x metres more men , more length built ( direct proportion ) less days , less length built ( direct proportion ) men 20 : 35 days 3 : 3 : : 56 : x therefore ( 20 x 3 x x ) = ( 35 x 3 x 56 ) x = ( 35 x 3 x 56 ) / 60 = 98 hence , the required length is 98 m . answer : e"