The following bus schedule is seen at a bus stop located somewhere between town A and town B.
Town A: 00:10, then every 20 minutes
Town B: 00:15, then every 20 minutes
If a person arrives at this bus stop at a random time, the probability that the next bus is for town B is:
Solution:
Buses for Town A arrive at: 00:10, 00:30, 00:50, …
Buses for Town B arrive at: 00:15, 00:35, 00:55, …
The combined pattern repeats every 20 minutes.
Consider one 20-minute cycle from 00:10 to 00:30:
· From 00:10 to 00:15 → next bus is Town B (5 minutes)
· From 00:15 to 00:30 → next bus is Town A (15 minutes)
Total interval = 20 minutes
Probability that the next bus is for Town B = 5 / 20 = 1/4
Correct answer: (b) 1/4
The following ternary figure shows the marks obtained by students A, B and C in an exam of 100 marks. Here, C received 10 marks in Physics, 50 marks in Chemistry and 40 marks in Mathematics.
Which one of the following is CORRECT?
Restaurants A, B, C, and D give the following offers:
A: one mocktail free for every two purchased
B: one mocktail free for every three purchased
C: two mocktails free for every six purchased
D: 30% discount on each mocktail
If all restaurants have the same marked price for each mocktail, in which restaurant would you pay the least if you drank eight mocktails?
