Maths Riddles

#221 - Maths Operator Riddle

Can you get a sum of 1000 using sixteen 4s and only an addition operator

#222 - Mathematics Problem

I want to fill my bucket using both cold and hot water.
I have two taps for both cold and hot water. The hot water tap fills the bucket in exact 6 hours and cold water tap fills the bucket in exact 4 hours.
I turn both of them simultaneously but I forgot to turn off another tap which removes the water out of the bucket. This tap can empty the bucket in 12 hours.

How Long will it take to fill the bucket?

#223 - Easy Math Problem

In a strange city , there are just 2 houses.

If one person from house1 goes to house2, then the population of house2 is twice the population of house1.
While if one person from house2 goes to house1, then the population of house2 is same as the population of house1.

what the population of each house ?

#224 - Friends Maths Puzzle

Ross five friends Rachel,Monica Phoebe,Joey and Chandler lives in the same road.

Rachel lives in house:A , Monica lives in house:B , Phoebe lives in house:C , Joey lives in house:D , Chandler lives in house:E

Mathematically
B*C*D = 1260
B + C + D = 2E
2A = E

The road numbers run from 2 to 222.

Can you tell the house number of each of Ross's friends ?

#225 - Michael Phelps Maths Problem

Michael Phelps , the famous swimmer can swim downstream in a lake in exact 40 minutes (with the lake current helping time).
He can swim upstream in a lake in exact 60 minutes (against the lake current).
The length of lake is 2 kilometers.

How long Michael Phelps can cover distance of one side at a still lake (no current).

#226 - Maths Picture Equation Puzzle

Can you solve this picture maths equation

#227 - Tricky Maths Eqaution Problem

Can you solve this tricky maths equation problem by replacing ? mark with correct symbol ?

19834 -----: 187
15921 -----: 153
17561 -----: 139
13734 -----: ???

#228 - Sachin Red Ferrari Number Riddle

Sachin Tendulkar bough a red ferrari with a strange 5 digit numbered plate.The water image of the number is 78633 more than my car number.All the digits of sachin's car number are distinct.

What is the original number on sachin's number plate?

#229 - Replace The Question Mark In The Picture

Replace The Question Mark in the picture with the correct number.

#230 - Maths Number Riddle

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number.