In a school, students may bring breakfast, buy it, or may not eat breakfast. If 1/4 of the students bring breakfast, 1/7 don't eat breakfast, and 187 buy it, how many students bring breakfast?
Solution
Correct Answer: Option D
মনেকরি, স্কুলে ছাত্র-ছাত্রীর সংখ্যা = x
প্রশ্নমতে, x/4 + x/7 + 187 = x
=> 187 = x - x/4 - x/7
=> 187 = (28x - 7x - 4x)/28
=> 187 = 17x/28
=> x = (28 * 187)/17
=> x = 298
∴ breakfast আনে = 298/4 = 77 জন
প্রশ্নমতে, x/4 + x/7 + 187 = x
=> 187 = x - x/4 - x/7
=> 187 = (28x - 7x - 4x)/28
=> 187 = 17x/28
=> x = (28 * 187)/17
=> x = 298
∴ breakfast আনে = 298/4 = 77 জন
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