৩০৮১
A buniessperson invest 2800 taka and earns 5% interest on some money and 4% interst on the rest of money. If the gets 128 taka as a profit at the end of the year, what is the amount of money on which he earns 5% interest?
উত্তর
1600
৩০৮২
By rowing, an boartman needs 4 hours for a kilometer hourney of 15 kilometers, He is able to go 5 kilometers with the currect and he could manage 3 kilometer against the current. What is his speed of rowing?
উত্তর
4 km/hour
৩০৮৩
The size of a rectangular room is 48 square feet. If the long decreases 2 feet and wide increase 2 feet then the size of the room remain unchanged. What is width of the in feet?
উত্তর
8
৩০৮৪
If the difference of two smaller of a right angle triangle is 7°, then which one is smallest angle?
উত্তর
41.5°
৩০৮৫
A 4 meter long ladder touches the top of a wall and makes a 45° angle with the horizon. What is the height of the wall?
উত্তর
42