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1. In a class of 200 students , 40 percent are girls . 25 percent of the boys and 10 percent of the girls signed up for a tour to Cox's bazar . What percent of the class signed up for the tour?
- A. 19%
- B. 19%
- C. 19%
- D. 19%
Answer: Option A
Explanation:
ধরি, total student = x তাহলে x এর 40% girls = .40% এদের মধ্যে 10% অর্থাৎ . 10 ×.40x girls এবং একইভাবে . 25 ×. 60x boys যার tour এ অর্থাৎ percent of the class signed up
= (. 25×.60x + . 10 ×.40x) /x ×100% = 19%
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