Question
The volume of a cube is 1331 cm³. If the cost of painting
the cube is Rs. 7 per cm², then find the cost of painting five faces of the cube.Solution
Let the length of the edge of the cube be ‘x’ cm.
Volume of cube = x³
ATQ;
1331 = x³
Or, x = 11
Area of five faces of the cube = 5x² = 5 × 11 × 11 = 605 cm²
Required cost = 605 × 7 = Rs. 4,235
A started a work such that he can complete the whole work in 30 hours. After working for 10 hours, he worked with the rate such that the whole work can ...
P can do a piece of work in 10 days, Q can complete double the work in 30 days and R can do the work in 20 days. If all of them together earn Rs. 3900, ...
A group of 8 men or 10 women can complete a certain task in 21 days. How many days will it take for a combination of 10 women and 4 men to complete the...
‘A’ alone can complete a work in 40 hours. ‘A’ started the work alone and left after working on it for 20 hours. If ‘B’ completed the rest o...
‘M’ and ‘N’ together can do a piece of work in 50 days. If ‘M’ is 50% more efficient than ‘N’, how long will ‘N’ take to do the work...
A’ and ‘B’ together can complete a work in 15 days while ‘A’ takes 20 days to complete the same work alone. If ‘C’ is 50% more efficient t...
25 men can complete a piece of work in 13 days. One man starts the work and after every day one more man joins the work and this continues till the work...
12Men and 12women can complete a piece of work in 9 days. 6 men and 15 women can complete the same work in 12 days. How long (in days) would it take 9 w...
- Pipes X and Y can fill a tank in 48 minutes and 80 minutes respectively. Another pipe Z can empty the tank in 2 hours. X and Z are opened together. If afte...
6 boys and 8 girls can do a piece of work in 12 days. 7 boys and 11 girls can do the same piece of work in 10 days. In how many days can 2 boys and 6 g...
