Value in row 1 $$\times$$ value in row 2 $$\times$$ Value in Row 3 = Value in Row 4
Let the unknown be $$x$$.
$$6 \times x \times 5 = 900$$
Hence $$x$$ = $$\frac{900}{30}$$
$$x$$ =$$ 30$$
Hence Option A is the correct answer
Create a FREE account and get: