Find the surface area of a 10cm × 4cm × 3cm brick.
By how much is three-fifth of 350 greater than four-seventh of 210 ?
In what ratio must a grocer mix two varieties of tea worth TK. 60 a kg and TK. 65 a kg so that by selling the mixture at TK. 68.20 a kg he may gain 10% ?
The sum of two numbers is 15 and the sum of their squares is 113. Find the numbers.
A clock is started at noon. By 10 minutes past 5, the hour hand has turned through :
Running at the same constant rate, 6 identical machines can produce a total of 270 bottles per minute. At this rate, how many bottles could 10 such machines produce in 4 minutes ?
A boatman goes 2 km against the current of the stream in 1 hour and goes 1 km along the current in 10 minutes. How long will it take to go 5 km in stationary water ?
How many prime numbers are less than 50 ?
Two numbers are in the ratio 1:2. If 7 is added to both, their ratio changes to 3:5. The greatest number is :
The simple interest on a certain sum of money for 2 1/2 years at 12% per annum is TK. 40 less than the simple interest on the same interest on the same sum for 3 1/2 years at 10% per annum. Find the sum.
The sum of two numbers is 28/25 of the first number. The second number is what percent of the first ?
A water tank is two-fifth full. Pipe A can fill a tank on 10 minutes and pipe B can empty it in 6 minutes. If both the pipes are open, how long will it take to empty or fill the tank completely ?
A train 240m long passed a pole in 24 seconds. How long will it take to pass a platform 650m long ?
The H.C.F of two number is 11 and their L.C.M is 693. If one of the numbers is 77 find the other.
Find the compound interest on Tk. 15,625 for 9 months at 16% per annum compounded quarterly.
What is the smallest number to be subtracted from 549162 in order to make it a perfect square ?
The sale price of an article including the sales tax is Tk. 616. The rate of sales tax is 10%. If the shopkeepers has made a profit of 12%, then the cost price of the article is :
A person crosses a 600m long street in 5 minutes. What is his speed in km per hour ?
The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero ?
Worker A takes 8 hours to do a job . Worker B takes 10 hours to do the same job. How long should it take both A and B, working together but independently , to do the same job?
If x =ya, y=zaand z =xc, then find the value of abc.
The difference between the length and breadth of a rectangle is 23 m. If its perimeter is 206 m, then its area is :
How many days are there in x weeks x days ?
The present ages of three persons are in proportions 4:7:9. Eight years ago, the sum of their ages was 56. Find their present ages(in years).
Which of the following numbers does not lie between 4/5 and 7/13 ?