Question

15 : 40 can be written in the simplest form as ______

• A. 2 : 3
• B. 5 : 4
• C. 8 : 3
• D. 3 : 8

Answer 1

The correct option is D

3 : 8

Consider the fraction $\frac{15}{40}$. Note that the HCF of 15 and 40 is 5. If we now divide both the numerator and the denominator by 5, the value of the ratio still remains the same.
i.e., $\frac{15}{40}=\frac{15÷5}{40÷5}=\frac{3}{8}$
Thus, the ratio 15:40 in its simplest form is 3:8.