- Two pipes A and B can fill a tank in 8 minutes and 12 minutes respectively. If both the pipes are opened simultaneously, after what time should B be closed so that the tank is full in 6 minutes?
32451Option A

Let after x minutes pipe B is closed

(1/8 + 1/12)*x + (1/8)*(6 -x) = 1

x= 3 minutes - On pipe P is 4 times faster than pipe Q and takes 45 minutes less than pipe Q. In what time the cistern is full if both the pipes are opened together?
2018161214Option D

Let P takes x minutes to fill the tank alone.

Q will take 4x minutes to fill the tank

4x â€“ x = 45, x = 15

So P will take 15 minutes and Q will take 60 minutes to fill the tank.

(60*15)/(75) = 12 minutes - The sum of the age of mother and daughter is 100 years. 5 years ago their age were in the ratio of 2:1. The ratio of the age of daughter and mother after 10 years.
1:23:59:45:72:1Option B

M + D = 100 and (M â€“ 5)/(D -5) = 2/1

we get D = 35 and M = 65.

After 10 years ratio = 45:75 = 3:5 - Sahil purchased an article for Rs. 8400 and sold it for a loss of 5%. From that money he purchased another article and sold it for a gain of 5%. What is the overall gain or loss?
Loss of Rs.25Gain of Rs.20Loss of Rs.15Gain of Rs.15Loss of Rs.21Option E

CP = 8400

SP = 8400 * 95/100 = 7980

CP = 7980

SP = 7980 * 105/100 = 8379

Difference = 8400 â€“ 8379 = 21

Loss of Rs.21 - A boat can travel with a speed of 12 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream.
3.10 hours4.25 hours5.12 hours2.20 hours3.15 hoursOption B

Speed downstream = (12+4) = 16 km/hr

Time taken to travel 68 km downstream

= 68/16=17/4 = 4.25 hours - 23,55,136,200,?,231
215220200225212Option D

+2^5, +3^4, +4^3, +5^2, +6^1

? = 225 - 8,15,?,71,120,183
2825303620Option D

+7*1, +7*3, +7*5, +7*7, +7*9

? = 36 - 11,22,?,74,115,166
4540474943Option E

+11,+21,+31, ,+41,+51

? = 43 - 12,25,?,61,84,113
4042474549Option B

+13,+17,+19,+23,+29

? = 42 - 58,59,57,63,39,?
160146159140150Option C

+1!,-2!,+3!,-4!,+5!

? = 159

**Directions(6-10):** Find the missing term ‘?’ of the following number series.