৩১১৩১
The electric company charges Tk. 0.30 per kilowatt-hour (KWH). Rahim used 2800 KWH in April, 3200 KWH in May, and 3600 in June. What was his average cost of electricity for the 3 months?
উত্তর
Tk. 72
৩১১৩২
How many liters of fuel are needed for a steamer to sail 700 kilometers if it uses 80 liters of fuel to sail 320 kilometers?
উত্তর
150
৩১১৩৪
If 15 is the fifth number in a series of 5 consecutive odd numbers, what is the third number in the series?
উত্তর
7
৩১১৩৫
A collection of books went on sale and 2/3 of these were sold for Tk. 2.30 each. None of the 36 remaining books were sold. What was the total amount received for the books that were sold?
উত্তর
180
৩১১৩৬
For every novel in the school library there are two science books, for each science book there are seven economice books. Express the ratio of economics books to science books to novels in the school library as a triple ratio.
উত্তর
14 : 2 : 1
৩১১৩৮
If both length and width of a rectangular plot for a garden are increased by 20%, how many percent of the plot would be increased?
উত্তর
20%
৩১১৩৯
A small factory with 3 machines has a job of stamping out a number of pan covers. The newest machine can do the job is 3 days, another machine can do it in 4 days, and the third machine can do it in 6 days. How many days will the factory take to do the job using all the machine?
উত্তর
1.333
৩১১৪০
A motor pool has 300 vehicles of which 30% are trucks. 20% of all the vehicles in the motor pool are diesel, including 15 trucks. What percent of the motor pool is composed of vehicles that are neither trucks nor diesel?
উত্তর
165%