Advertisements
Advertisements
प्रश्न
If 12 boys earn Rs 840 in 7 days, what will 15 boys earn in 6 days?
उत्तर
\[\text{ Earnings of 12 boys in 7 days = Rs . 840 } \]
\[ \therefore \text{ Earnings of 12 boys in 1 day } = Rs . \frac{840}{7} = Rs . 120\]
\[ \therefore \text{ Earnings of 1 boy in 1 day } = Rs . \frac{120}{12} = Rs . 10\]
\[ \therefore \text{ Earnings of 1 boy in 6 days = Rs } . \left( 10 \times 6 \right) = Rs . 60\]
\[ \therefore \text{ Earnings of 15 boys in 6 days } = Rs . \left( 60 \times 15 \right)\]
\[ = Rs . 900\]
APPEARS IN
संबंधित प्रश्न
A 5 m 60 cm high vertical pole casts a shadow 3 m 20 cm long. Find at the same time the height of a pole which casts a shadow 5 m long.
A cistern can be filled by a tap in 4 hours and emptied by an outlet pipe in 6 hours. How long will it take to fill the cistern if both the tap and the pipe are opened together?
A birthday party is arranged in third floor of a hotel. 120 people take 8 trips in a lift to go to the party hall. If 12 trips were made how many people would have attended the party?
For fixed time period and rate of interest, the simple interest is directly proportional to the principal.
Write whether the following statement vary directly, vary inversely with each other, or neither of the two.
Simple interest on a given sum and the rate of interest.
Write whether the following statement vary directly, vary inversely with each other, or neither of the two.
Sales Tax and the amount of the bill.
The variable x varies directly as y and x = 80 when y is 160. What is y when x is 64?
Match each of the entries in Column I with the appropriate entry in Column II
| Column I | Column II |
| 1. x and y vary inversely to each other | A. `x/y` = Constant |
| 2. Mathematical representation of inverse variation of quantities p and q |
B. y will increase in proportion |
| 3. Mathematical representation of direct variation of quantities m and n |
C. xy = Constant |
| 4. When x = 5, y = 2.5 and when y = 5, x = 10 | D. `p oo 1/q` |
| 5. When x = 10, y = 5 and when x = 20, y = 2.5 | E. y will decrease in proportion |
| 6. x and y vary directly with each other | F. x and y are directly proportional |
| 7. If x and y vary inversely then on decreasing x | G. `m oo n` |
| 8. If x and y vary directly then on decreasing x | H. x and y vary inversely |
| I. `p oo q` | |
| J. `m oo 1/n` |
A recipe for a particular type of muffins requires 1 cup of milk and 1.5 cups of chocolates. Riya has 7.5 cups of chocolates. If she is using the recipe as a guide, how many cups of milk will she need to prepare muffins?
The students of Anju’s class sold posters to raise money. Anju wanted to create a ratio for finding the amount of money her class would make for different numbers of posters sold. She knew they could raise Rs 250 for every 60 posters sold.
- How much money would Anju’s class make for selling 102 posters?
- Could Anju’s class raise exactly Rs 2,000? If so, how many posters would they need to sell? If not, why?
