১১৯২১
A cylindrical rod of iron, whose height is equal to its radius, is melted and east into spherical balls whose radius is half the radius of the rod. Find the number of balls.
উত্তর
6
১১৯২২
A person's present age is two-fifth of the age of his mother. After 8 years, he will be one-half of the age of his mother. How old is the mother at present?
উত্তর
40 years
১১৯২৩
The length of a rectangle is halved, while its breadth is tripled. What is the percentage change in area?
উত্তর
50% increase
১১৯২৪
Fresh fruit contains 68% water and dry fruit contains 20% water. How much dry fruit can be obtained from 100kg of fresh fruits?
উত্তর
40 kg
১১৯২৫
The salaries a of A, B and C are in the ratio of 1:2:3. The salary of B and C together is Tk. 6,000. By what percent is the salary of C more than that of A?
উত্তর
250%
১১৯২৬
Two numbers are in the ratio 3:7. If 6 be added to each of them, then they are in the ratio 5:9. Find the numbers?
উত্তর
9 and 21
১১৯২৮
A bag contains 50p, 25p and 10p coins in the ratio 5:9:4, amounting to Tk. 206 Find the number of coins of each type respectively?
উত্তর
20,03,60,160
১১৯২৯
Painter A can paint a house in 16 days, and painter B can do the same work in 20 days. With the help of painter C, they paint the house in 8 days only. Then, Painter C alone can do this task in -
উত্তর
80 Days
১১৯৩০
A and B start at the same time with speeds of 40 km/hr and 50 km/hr respectively. If in covering the journey A takes 15 minutes longer than B, the total distance of the journey is
উত্তর
50 km