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For The Mathematically Inclined

Anil Saigal
05/11/2017

Problem 1:

A class average score in an exam is 70. The average of students who scored below 60 is 50. The average of students who scored 60 or more is 75. If the total number of students in this class is 20, how many students scored below 60? 

Problem 2:
Four children have small toys. The first child has 1/10 of the toys, the second child has 12 more toys than the first, the third child has one more toy of what the first child has and the fourth child has double the third child. How many toys are there? 


 
 
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Please send your solutions anil@lokvani.com. 

Use Problem Solutions M-051117 as the subject line. Please include your full name in the text of the main message. Everyone with the right answer will be acknowledged in the next issue of Lokvani. 

Please do not post your solution in Post Comments. No credit will be given for solutions not sent to anil@lokvani.com. 

If you need clarification on any problem, please contact anil@lokvani.com. 

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Problems from 04/27/17

Problem 1:
If a tire rotates at 400 revolutions per minute when the car is traveling 60 miles/h, what is the circumference of the tire? 

Problem 2:
It takes a boat 3 hours to travel down a river from point Waltham to point Boston, and 5 hours to travel up the river from Boston to Waltham. How long would it take the same boat to go from Waltham to Boston in still water?
 

Congratulations to Ramachandran Balakrishna and Kishore Balsara, who were the winners of the last set of puzzles.



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