A boy read 3/8th of a book on one day and 4/5th of the remainder on another day. If there were 30 pages unread, how many pages did the book contain?

A 240

B 300

C 600

D 800

Solution

Correct Answer: Option A

মনেকরি, বইয়ে মোট পৃষ্ঠা আছে = x টি 
১ম দিনে পড়ে = 3x/8 অংশ
বাকি থাকে = x - (3x/8) = 5x/8 অংশ

২য় দিনে পড়ে = (5x/8) এর 4/5 অংশ
                   = x/2 অংশ

মোট পড়া হয়েছে = 3x/8 + x/2 = (3x + 4x)/8 = 7x/8

প্রশ্নমতে,
x - (7x/8) = 30
⇒ x/8 = 30
⇒ x = 30 × 8
∴ x = 240

Practice More Questions on Our App!

Download our app for free and access thousands of MCQ questions with detailed solutions