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प्रश्न
Rahul needs stamps of Rupees 25 for his parcel. He went to the post office. Only stamps of Rs 1, Rs 2, Rs 5 and Rs 10 were there at that time. Using those stamps in how many different ways can he make Rs 25?
Can you show five different ways? What is the heaviest parcel he can send using stamps of Rs 25?
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उत्तर
The 5 different ways are given below:
-
Rahul can buy five stamps of Rs 5 each in order to buy stamps of Rs 25 for his parcel. Cost of 1 stamp = Rs 5 Cost of 5 stamps = Rs 5 × 5 = Rs 25
- Rahul can buy two stamps of Rs 10 each and one stamp of Rs 5 in order to buy stamps of Rs 25 for his parcel. Cost of two stamps of Rs 10 each = Rs 10 × 2 = Rs 20 Total cost of two stamps of Rs 10 each and one stamp of Rs 5 = Rs 20 + Rs 5 = Rs 25
- Rahul can buy ten stamps of Rs 2 each and one stamp of Rs 5 in order to buy stamps of Rs 25 for his parcel.
Cost of ten stamps of Rs 2 each = Rs 2 × 10 = Rs 20 Total cost of ten stamps of Rs 2 each and one stamp of Rs 5 = Rs 20 + Rs 5 = Rs 25 - Rahul can buy three stamps of Rs 5 each and five stamps of Rs 2 each in order to buy stamps of Rs 25 for his parcel. Cost of three stamps of Rs 5 each = Rs 5 × 3 = Rs 15 Cost of five stamps of Rs 2 each = Rs 2 × 5 = Rs 10 Total cost of three stamps of Rs 5 each and five stamps of Rs 2 each = Rs 15 + Rs 10 = Rs 25
- Rahul can buy three stamps of Rs 5 each and one stamp of Rs 10 in order to buy stamps of Rs 25 for his parcel. Cost of three stamps of Rs 5 each = Rs 5 × 3 = Rs 15 Total cost of three stamps of Rs 5 each and one stamp of Rs 10 = Rs 15 + Rs 10 = Rs 25
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संबंधित प्रश्न
Father gave them some idea of the weight of each thing.
| Thing loaded | Weight |
| A sack of wheat | 100 kg |
| A sack of rice | 35 kg |
| Water tank | 50 kg |
| Almirah | 70 kg |
| A table | 10 kg |
| A chair | 5 kg |
| A mattress | 20 kg |
| Bamboo ladder | 10 kg |
| Pots and pans | 10 kg |
Find out the total weight they had loaded on the cart.
Which things should be removed so that the weight of the load is not more than 700 kg?
Now, you also make your own balance. Write down how you made it. Also draw a picture of your balance in the box below.
Make groups of three things. For example - eraser, ball and paper. Use the balance to arrange them in order of weight-the lightest, the one with in-between weight, the heaviest.
Complete the table with at least five examples.
| Lightest | In-between weight | Heaviest |
| Paper | Eraser | Ball |
Is the weight on any of the pans equal to 1 kilogram? Mark it.
Guess and write the weight of each thing he bought - in g or kg.
| Items | Weight |
| Rice | 5 |
| Sugar | 1 |
| Mustard seeds | 10 |
| Wheat | 3 |
| Dal | 500 |
| Tea | 250 |
| Pepper | 25 |
Ritu is weighing her toys. She wants to know if her tractor is heavier than her car. How would you help her to find out quickly?
Which is the heaviest thing you have seen?
| Postal Rates |
| Postal Items | Postal Rates (in Rs.) |
| Single Post Card | 0.50 |
| Printed Post Card | 6.00 |
| Inland Letter | 2.50 |
|
Letter weighing - i) 20 grams or less ii) For every additional 20 grams |
5.00 2.00 |
|
Parcel weighing - i) 50 grams or less ii) For every additional 50 grams |
5.00
3.00 |
How much will you have to pay for stamps on a letter weighing 50 grams?
All oranges have equal weight. The two papayas have the same weight. The weights in the first and second balances are equal.
How many oranges balance the weight in the third?
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