Question

pencils pens
18 72
29 a
35 140
b 168
determine the missing value for the letter b.
39
42
63

Explanation:

Step1: Find the ratio of Pens to Pencils

First, we check the ratio of Pens to Pencils for the first row: $\frac{72}{18} = 4$. Let's verify with the third row: $\frac{140}{35} = 4$. So the ratio of Pens to Pencils is 4.

Step2: Calculate B using the ratio

For the row with B, we know the number of Pens is 168. Since the ratio of Pens to Pencils is 4, we can find Pencils (B) by dividing the number of Pens by 4. So $B = \frac{168}{4}$.

Step3: Compute the value of B

$\frac{168}{4} = 42$.

Answer:

42