I need help with this promblem

Writing the simplest form of a fraction means the numerator and the denominator have no common factors other than 1.a. trueb. false

Acircle has a circumference of 2 pi cm. which statement about the circumference and area is true? a comparison of the area and circumference is not possible since the area cannot be determined. the numerical values of the circumference and area of the circle are equal. the numerical value of the circumference is greater than the numerical value of the area. the numerical value of the circumference is less than the numerical value of the area.

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class