Figure out the Formula to Predict the Next Number in a Series

Last Problem:

The product (multiplication) of the digits of a two digit number is 8. When 18 is added to the number, the digits are reversed. What is the number? (This is not so much a math problem but a puzzle to solve).

Answer:

24

4 x 2 = 8. Now, add 18 to 24: 24 + 18 = 42 (which is 24 in reverse).

Today’s Problem:

What is next number in the following series of numbers

3, 4, 6, 9 ?

A Tangle for Your Mind to Unravel

Last Problem:

A man covers 27 miles in 9 hours and returns home at a speed of 5 miles per hour. What is his average speed for his entire journey?

Answer:

4 miles per hour

Since he covers 27 miles in 9 hrs getting to his destination, it means his speed is 3 miles per hour. For the return journey his speed is given is 5 mules per hours. He travels the same distance goes as coming, so the average speed is (3+5)/2 = 4 miles per hour.

Today’s Puzzle:

The product (multiplication) of the digits of a two digit number is 8. When 18 is added to the number, the digits are reversed. What is the number? (This is not so much a math problem but a puzzle to solve).

What Am I?

Last Problem:

A snail is at the bottom of a 20 meters deep pit. Every day the snail climbs 5 meters upwards, but at night it slides 4 meters back downwards. How many days does it take before the snail reaches the top of the pit?

Answer:

16 days. Since the snail moves up 1 meter a day so it will reach 15 meters in 15 days. next day it will again climb 5 meters upward and reaches the top.

Today’s Mind Puzzle:

I come once in a day, twice in a hour and three times in a minute. What am I?