Averages
October 15, 2010 | 
Author Here’s and example of a SMART MATH problem for AVERAGES.
Problem
The average age of 40 boys of a class is 12 years. When 10 new boys are admitted, the average is increased by 0.1 year. What is the average age of the new boys?
- 12.1 years
- 12.4 years
- 12.3 years
- 12.5 years
- 13.0 years
Posted in Averages, Smart Math | 
Tags: Averages, Math Tricks, Mental Math, Smart Math | 
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Here’s and example of a SMART MATH problem for AVERAGES.
Problem
In a class of 40, there are 10 boys at the age of 12 years, 12 at the age of 12.5 and the rest at the age of 13. The average age of all boys in the class is ___________ years.
- 12.1
- 12.2
- 12.5
- 12.6
- 12.7
Posted in Averages, Smart Math | Tags: Averages, Math Tricks, Mental Math, Smart Math | 2 Comments »
Here’s and example of a SMART MATH problem for AVERAGES.
Problem
In an exam, the average marks obtained by a student in English, Algebra, Geometry and Drawing were 50. His average marks in Algebra, Science, Social Studies and Craft were 70. If the average marks in all 7 subjects were 58. What is his Algebra score?
- 50
- 52
- 60
- 74
- 96
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Here’s and example of a SMART MATH problem for AVERAGES.
Problem
In a class of 80 students, there are 50 girls and 30 boys. The average weight of the class is 50 lbs. If the average weight of boys is 55 lbs, what is the average weight of girls?
- 45 lbs.
- 47 lbs.
- 53 lbs.
- 46 lbs.
- 51 lbs.
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Here’s and example of a SMART MATH problem for AVERAGES.
Problem
What is the Geometric mean of 24, 27 and 72?
- 29
- 30
- 36
- 42
- 54
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