In a bag of small balls 1/4 are green, 1/8 are blue, 1/12 are yellow and the remaining 26 white. How many balls are blue?
In a school 50% of the students are younger than 10, 1/20 are 10 years old and 1/10 are older than 10 but younger than 12, the remaining 70 students are 12 years or older. How many students are 10 years old?
If the length of the side of a square is doubled, what is the ratio of the areas of the original square to the area of the new square?
The division of a whole number N by 13 gives a quotient of 15 and a remainder of 2. Find N.

Question

In a bag of small balls 1/4 are green, 1/8 are blue, 1/12 are yellow and the remaining 26 white. How many balls are blue? 
In a school 50% of the students are younger than 10, 1/20 are 10 years old and 1/10 are older than 10 but younger than 12, the remaining 70 students are 12 years or older. How many students are 10 years old? 
If the length of the side of a square is doubled, what is the ratio of the areas of the original square to the area of the new square? 
The division of a whole number N by 13 gives a quotient of 15 and a remainder of 2. Find N.