What a Math

If 21x = 79x, what is the value of x?




Similar Math Riddles

Find the combined weight of the Cat, Dog and Rabbit in the given picture.

 Weight of Animals

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How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

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A famous swimmer can swim downstream in a lake in exactly 40 minutes with the lake current.
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Using mathematical symbols like +, -, and x in order to make the equations correct. Replace # with the above-given symbols.

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Before the start of the car race, John and Jacob have the same amount of fuel in their car. With this fuel, John can drive for 4 hours while Jacob can drive five hours.
After a time they realize that the amount of fuel left in John's car is 1/4th of the fuel in Jacob's.

For how long they are racing?

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You have a roll of cloth 1km long. You have a machine which cuts this roll into pieces of 10-meter-long cloth.

How long would it take for the machine to cut the roll if each cut took 4 secs?

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You need to arrange three 7 and mathematical symbols to form number 1?

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Arrange the numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 above and below the division line in a manner that the thus formed fractions equal to 1/3.

(You can use one number only once)

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In the 1920s, people feared that crossword puzzles would contribute to illiteracy.