১২৪১১
The average of 13 numbers is 68. If the average of the first 7 numbers is 63 and that of the last 7 numbers is 70, find the 7th number?
উত্তর
47
১২৪১২
In a survey, 30% of the people surveyed owned a personal computer and 75% owned a cellular telephone. If 25% owned both a cellular telephone and a personal computer, then the percentage of the people who does not have either of the instrument?
উত্তর
20%
১২৪১৩
A student first reduced a number by 20 percent and then increased it again by 20 percent. If the difference between the two new numbers was 8, then what is the original number?
উত্তর
50
১২৪১৫
A truck driver must complete a 180 mile trip in 4 hours. If his average speed is 50 miles per hour for the first 3 hours, then how fast must he travel for the final hour?
উত্তর
30
১২৪১৬
Novera bought a ticket to a cricket match for Tk. 25 and later sold the ticket to Nahid for Tk 75. What was the percent increase in the price of the ticket?
উত্তর
200%
১২৪১৯
The ratio of the angles of a triangle is 2 : 3 :4. What is the largest angle in degrees?
উত্তর
80
১২৪২০
In the figure ABCD is a square. If the length of the square is 10ft, then what will be the area of the triangle OCD?
উত্তর
25 sft