Easy math riddles

logicmathshort

An electric train

If an electric train is going east at 60 miles an hour and there is a strong westerly wind, which way does the smoke from the train drift?
here is no smoke coming from electric trains.
83.29 %
33 votes

logicmath

Three daughters

Sam has got three daughters. The eldest daughter is the most honest girl in the universe and she always speaks truth. The middle daughter is a modest woman. She speaks truth and lies according to the situations. The youngest one never speaks truth. Not a single word she spoke was true and would never be true. Sam brought a marriage proposal for one of his girls. It was John. John wanted to marry either the eldest or the youngest daughter of Sam as he can easily identify whether the girl speaks truth or lie! John told his desire to Sam. However, Sam laid a condition. He told John that he will not say who the eldest, middle or youngest one is. Also, he allowed john to ask only one question to identify the eldest or youngest so he can marry one. John asked one question and found the right girl. What was the question and whom should he pick? He asks this question to one of the daughters. If he asked this question to older daughter pointing at other two, he probably would know the youngest one! NO matter, she always speaks truth. If he asked the question to middle one, probably he can choose either. If he asked the youngest one, she always lies and he can find eldest one! No matter, he has to choose the youngest one based on the answer.
The question he asked is, ‘Is she older than her!’ He asks this question to one of the daughters. If he asked this question to older daughter pointing at other two, he probably would know the youngest one! NO matter, she always speaks truth. If he asked the question to middle one, probably he can choose either. If he asked the youngest one, she always lies and he can find eldest one. No matter, he has to choose the youngest one based on the answer.
86.00 %
40 votes

logicmathshort

100

Can you arrange four 9's and use of atmost 2 math symbols, make the total be 100?
99 / .99
85.67 %
39 votes

logicmathshort

Box full of marbles

There is a box full of marbles, all but two are blue, all but two are green, and all but two are red. How many marbles are in the box ?
There are 3 marbles (1 blue, 1 green, and 1 red).
86.62 %
42 votes

funnylogicmath

Infinite number of mathematicians

An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?
Just one.
88.64 %
50 votes

logicmathshort

Three positive whole numbers

Find three positive whole numbers that have the same answer added together or when multiplied together.
1,2, & 3. 1 x 2 x 3 = 6 and 1 + 2 + 3 = 6
83.45 %
42 votes

logicmathshort

Painting the doors

In a new Engineering Hostels they have 100 rooms. Ankit Garg was hired to paint the numbers 1 to 100 on the doors. How many times will Ankit have to paint the number eight ?
20 times.
82.28 %
39 votes

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