Monday, June 27, 2016
numbers
How many 4 digit nos.are there that is divisible by 29 and the sum of digits are equal to 29.
Sunday, May 1, 2016
Sunday, April 17, 2016
Wednesday, February 17, 2016
triangles / ratio and proportions
The Ratio of altitudes of a triangle are 1:2:3. Find the ratio of its side.
Sunday, February 14, 2016
Wednesday, February 10, 2016
HCF and LCM
The HCF of two numbers is 1/6th of the LCM of those two numbers. if one of the numbers is 15, find the other?
time and work
A certain number of men complete a piece of work in 60 days. if there were 8 men more, the work could be finished in 10 days less. How many men were there originally?
polygon
The sum measure of angles of a regular polygon is 68 rt angles. How many sides does this polygon have?
time and work
16 men can do a piece of work in 16 days. 4 days after they started the work, eight more men joined them. How many days will they take now to complete the work?
Average
The average age of 20 students in a class is 14 years. A student of age 16 leaves them and a new student joins them. Now their average age becomes 13.8 years. What is the age of the new boy?
Monday, February 8, 2016
Puzzle
There are a 1000 locks in closed position. 1000 children numbering 1 to 1000 approach the lock one by one. The rule is the child (say with number 'n') can open or close the lock numbering in multiples of "n" only.
so the child in number one position can open all the locks. Child number 2 will be able to close all the locks in multiples of 2 (like 2, 4, 6 .... upto 1000). The other locks will remain as they are.
After all the 1000 children have had their chance, how many locks will be in open position.
so the child in number one position can open all the locks. Child number 2 will be able to close all the locks in multiples of 2 (like 2, 4, 6 .... upto 1000). The other locks will remain as they are.
After all the 1000 children have had their chance, how many locks will be in open position.
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