THINK
THICK
TRICK
TRACK
TRACT
TRAIT
TRAIN
BRAIN

1st burger as it has few sesame seeds when compared to the other burgers.

This child would have been born before 1947 (Partition time) and would have moved to India.

Darkness

Since 1 round is already gone without firing, we have 3 more empty slots. Also, there is a probability of a filled slot. Hence the probability of a miss is 3/4 = 0.75

In case if we spin the barrel, then there are 2 filled slots. Hence the probability of a miss is 4/6 = 0.67

Hence, we are better off pulling the trigger again.

Total 14 times.

We will need to pick at least 59 balls.

56 = 8 * 7 (8 balls of all other colors except red)
3 red balls (as per the selection requirement)

Total = 59.

Train is travelling at 60 miles/hour. Both the length of train and tunnel is same – 1 mile.

Train with its front end will reach the end of tunnel in 1 minute.. However, tail end has just entered the tunnel.

Hence for the complete train to exit the tunnel, it will take 2 minutes.

Weights of 1, 3, 7 and 19 pounds can be used.

These 4 weights can be used in various combinations to weigh anything ranging from 1 to 30 pounds.

Pawns in Chess game