- A135
- B25
- C160
- D115
Step-by-Step Solution
Let fitting , so welding . At least one , so and . Welding , and only welding . 135 is the whole Welding circle, 25 is only fitting, and 160 is everyone who knows at least one skill.
Answer: D) 115
A Durgapur plant has 170 workers; 10 know neither welding nor fitting and 20 know both. Those who know welding are three times those who know fitting. How many know only welding?
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