৭৯৩১
The ratio of the present ages of two friends is 3 : 5. After 7 years, the ratio becomes 2 : 3. What will be the ratio of their ages after 10 years?
উত্তর
31 : 45
৭৯৩২
How much water should be added to 80 liters of pure milk to gain extra 20% profit when selling the mixture at the price of pure milk?
উত্তর
16 liters
৭৯৩৩
A fruit seller sells 20 oranges for Tk. 900 and suffers a loss equal to the cost price of 5 oranges. Find the cost price of one orange.
উত্তর
Tk. 60
৭৯৩৪
A fighter jet covers a certain distance at a speed of 1200 km/h in 5 hours. What speed must it maintain to cover the same distance in 250 minutes?
উত্তর
1440 km/h
৭৯৩৫
Sumon sells a mobile phone to Tania at a profit of 20%. Tania then sells that phone to Rafi for Tk. 1800, making a profit of 25%. At what price did Sumon purchase the mobile phone?
উত্তর
Tk. 1200
৭৯৩৬
What is the difference between simple and compound interest at 10% per annum on a sum of Tk. 6000 at the end of 2 years?
উত্তর
Tk. 60
৭৯৩৭
If ABC and PQR are similar triangles in which ∠A = 46° and ∠B = 82°, then ∠C is:
উত্তর
52°
৭৯৩৮
A and B are centers of two circles that touch each other externally, as shown in the figure. What is the area of the circle whose diameter is AB?
উত্তর
49π/4 square cm
৭৯৩৯
The slope of the line 3x + y = 5 is not the same as the slope of which one of the following lines?
উত্তর
x + 3y = 6