Question

Solve the proportion. 10/a = 15/30 a. 2 b. 20 c. 5 d. 10

Answer 1

Answer:  The correct option is

(b) 20.

Step-by-step explanation:  We are given to solve the following proportion :

$\dfrac{10}{a}=\dfrac{15}{30}~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(i)$

We will be solving the given proportion by the method of cross-multiplication.

From (i), we have

$\dfrac{10}{a}=\dfrac{15}{30}\\\\\\\Rightarrow \dfrac{10}{a}=\dfrac{1}{2}\\\\\\\Rightarrow a=2\times10\\\\\Rightarrow a=20.$

Thus, the required solution is a = 20.

Option (b) is CORRECT.

Answer 2

The answer is B. a= 20.