Merin Prakash

Three computers, A, B and C can be used to run an analysis, either individually or together. A will take 60 minutes to complete the analysis. B is twice as fast as A. C will take the same time to complete the analysis as A and B running together. How many minutes will it take to complete the analysis if all three computers work together?

The total expenses of a hotel are partly fixed and partly variable, varying linearly with the number of guests. The average expense per guest is $70 when there are 25 guests and $60 when there are 50 guests. The average expense per guest when there are 100 guests is

70% of the employees in a corporation have DVD players, 75% have microwave ovens, 80% have flat screen TVs and 85% have washing machines. At least what percentage of employees has all the four gadgets?

The number of terms which are common in the two series 17 , 21 , 25 , … , 417 and 16 , 21 , 26 , … , 466 is

In an examination, the score of A was 10% less than that of B, the score of B was 25% more than that of C, and the score of C was 20% less than that of D. If C scored 56, then the score of A was

In the final examination, Bishnu scored 52% and Asha scored 64%. The marks obtained by Bishnu are 29 less, and those by Asha are 34 more than the marks obtained by Ramesh. The marks obtained by Geeta, who scored 84%, are

630 members of a group are arranged in rows for a group photo. Each row contains 3 fewer members than the row ahead of it. The number of rows that is not possible is

Madan went to the market with certain sum of money. With his money he can buy either 50 apples or 40 pineapples. He retains 10% of the money for buying milk. If he buys 20 pineapples, then the number of apples he can buy is

85 children went on a school trip to an amusement park with three rides - merry go round, roller coaster, and Ferris wheel. Of them, 20 took all three rides and 55 took at least two of the three rides. Each ride cost $1, and in total $145 were spent on the rides. How many children took exactly one ride?

85 children went on a school trip to an amusement park with three rides - merry go round, roller coaster, and Ferris wheel. Of them, 20 took all three rides and 55 took at least two of the three rides. Each ride cost $1, and in total $145 were spent on the rides. How many children did not try any ride?