# Become Normal!!

1,158.2K Views

Robi is a very serious student.
On the first day of this year his seriousness for study was 1 hour.
But after that day he increases his seriousness for study everyday by 10 minutes!!
On the other hand Fariha is a very crazy girl!!
On the first day she showed her craziness to her parents for 2 hours!!
And everyday she decreases her craziness for 2 minutes.

Now can we find out on which date both Robi and Fariha will become normal again?

Notes:
1.His/her seriousness or craziness can’t be negative or more than 24 hours.
2.After the day, he/she become normal, he/she again starts to increase his/her seriousness/craziness.
3.Look on the first day Robi was normal but not Fariha.
4.When he/she reaches the limits he/she, all on a sudden, becomes normal.

thesucker Expert Asked on 4th June 2016 in

Both are in Arithmetic Progression then

in Robi’s case

a=1

d=10/60=1/6

tn=24

a+(n-1)d=tn

1+(n-1)1/6=24

(n-1)1/6=23

(n-1)=138

n=139

So in 139 days Robi’s seriousness reach 24 hours then we can assume in 140 day his Seriousness become normal

In Fariha’s case a=2

d=2/120=1/60

tn=0

here n=121

So in 121 days Fariha’s craziness becomes normal.

so both will become normal again lcm(121,140)=16940.

Answer is 16940 [Assuming Robi ‘s seriousness can reach 24 hours and next day it become normal, if in the same day of reaching 24 hours his seriousness becomes normal then answer will be (121,139)=16819 ]

dyj Expert Answered on 4th June 2016.

• ## More puzzles to try-

• ### Coin toss betting having no loss no win puzzle

Two friends were betting. One said to the other, “The coin will be flipped twenty times and each time the ...Read More »
• ### Open the Laptop

Open a Laptop which is password protected. Hint for the password is given as below: 1 mobile 3 books 2 ...Read More »
• ### Table with four coins

A square table has a coin at each corner.  Design an execution sequence, each of whose steps consists of one ...Read More »
• ### What is the chance that the last passenger will get his seat?

There are 100 passengers boarding a 100 passenger airplane. When passenger 1 gets onto the plane, he is dissoriented, so ...Read More »
• ### Cake cutting puzzle

Two twin brothers share the same birthday. Their father gets them a perfectly rectangular birthday cake, and the brothers decide ...Read More »
• ### Make the Line Smaller

Sherlock Holmes was challenged to make a pre-drawn line smaller without erasing it. He did it in fractions of seconds. ...Read More »
• ### The strongest muscle in the body is riddle

1. The strongest muscle in the body is ______. 2. ______ is the only animal that can not jump. 3. ...Read More »
• ### Why did the waiter call the the man an Admiral?

A man walks into a restaurant and the the waiter says good day Admiral. Why did the waiter call the ...Read More »
• ### Strong as round

He is strongest when you see him as round, but he is often viewed in other forms. He lifts and ...Read More »
• ### Lines of Balls

You have 10 balls with you. A friend of yours out of nowhere asks you to place those ten balls ...Read More »
• ### how far are the two ends of chain from each other?

There is a chain nailed to the wall. The chain is 10 feet long and the center of the chain ...Read More »

• ### Candies interview puzzle

In a closed jar, There are Three strawberry candies, Two mango candies and Five pineapple candies. You can’t see inside ...Read More »
• ### Count the Triangle

Can you count the number of triangles in the picture below?Read More »
• ### What is the chance of flipping heads again?

You have three coins. One always comes up heads, one always comes up tails, and one is just a regular ...Read More »
• ### Floors Puzzle

We live in a large tower block, 10 floors high. My 5 year old son goes to school each day ...Read More »
• ### CODING-DECODING

In a certain code language, GERMANY is written as H2SN1OZ and BELARUS is written as C2M1S5T. How is FRANCE written ...Read More »
• ### A girl’s and a boy’s Murder Mystery Puzzle

A girl and a boy were out one night. They were in the woods, and they saw 3 men hunting. ...Read More »
• ### When is Cheryl’s Birthday?

Albert and Bernard just became friends with Cheryl, and they want to know when her birthday is. Cheryl gives them ...Read More »
• ### Train Passes the Tunnel

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it ...Read More »