Question

What was the ratio of schools having laboratory to those having library?

• A. 1 : 2
• B. 5 : 3
• C. 2 : 1
• D. 2 : 3

Hint:

When asked for a ratio, always combine overlapping groups before comparing. Don’t double count “both” cases — add once to each.

Answer 1

The Correct Option is B

From the previous question, we calculated: - Schools with lab only = 20 - Schools with both lab and library = 5 $\Rightarrow$ Total schools with laboratory = $20 + 5 = 25$ - Schools with library only = 10 - Schools with both = 5 $\Rightarrow$ Total schools with library = $10 + 5 = 15$ Step 1: Ratio \[ \text{Lab} : \text{Library} = 25 : 15 = \frac{5}{3} \Rightarrow \boxed{5 : 3} \]