1. Two numbers N and 16 have LCM = 48 and GCF = 8. Find N. 2. If the area of a circle is 81pi square feet, find its circumference.
Find the greatest common factor of 24, 40 and 60.
3. In a given school, there are 240 boys and 260 girls.
a) What is the ratio of the number of girls to the number of boys?