A tank fills in the sequence of 10, 20, 40, 80.... (Means 10 litres in 1 hr, 20 litres in 2nd so on.). If at the 4th hour the tank is 1/4 full .When will it be full?
Choose the correct choice
A) 3
B) 4
C) 5
D) 6
E) 7
At the 4th hour, it ll fill 80 litres   80 litres is 1/4th of a tank...then the full tank can have  80 * 4= 
<gadget id="calculator"> 80 * 4</gadget>
<output>320</output>
320 litres   Given series 10, 20 ,40 ,80, (ie) each litre is double of previous litres   so at the 5th hour tank filled ll be   80 * 2= 
<gadget id="calculator">  80 * 2</gadget>
<output>160</output>
160liters   At the 6th hr it ll fill the full tank (ie) 160 * 2= 320   So the tank ll be full at 6th hr   ANSWER:6
<result>D</result>
A tank fills in the sequence of 10, 20, 40, 80.... (Means 10 litres in 1 hr, 20 litres in 2nd so on.). If at the 4th hour the tank is 1/4 full .When will it be full?