If $\begin{bmatrix}a \:\: 7 \:\:\:b\:\:\:9\\ \end{bmatrix}=\begin{bmatrix}3\: \: 12 \:\:\:c\:\:\:18\\ \end{bmatrix}$, then b=?

E

Editor

Sep 18, 2022

If $\begin{bmatrix}a \:\: 7 \:\:\:b\:\:\:9\\ \end{bmatrix}=\begin{bmatrix}3\: \: 12 \:\:\:c\:\:\:18\\ \end{bmatrix}$, then b=?

Difficulty: Easy

A:

12

B:

c

C:

a

D:

9

ID: 63273dbaca83163ac3a11a6f