Advertisements
Advertisements
Question
There are 3 marbles of the same size but one marble is slightly heavier or lighter than the other two. Can you find which is that marble and if it is heavier or lighter? You can use a balance only two times.
Solution
Let Ml, M2 and M3 be the three marbles. One of them is heavier or lighter than the others.
Put marbles Ml and M2 in different pans.
Case - I - If both will be equal, then M3 is heavier or lighter than these marbles.
Case - II - Put Ml and M3 in different pan,
(i) if they are equal then M2 is heavier or lighter.
(ii) Ml < M3, then M2 = M3 and Ml is lighter than Ml and M3.
APPEARS IN
RELATED QUESTIONS
Mannu and Jaiju put a pencil and geometry box in the two pans of the balance. Which pan will go down? Why? Draw a picture to show it.
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 |
Can you find your own weight using this balance?
Name 5 things that we usually buy -
| In Grams | |
| 1 | |
| 2 | |
| 3 | |
| 4 | |
| 5 |
| In Kilograms | |
| 1 | |
| 2 | |
| 3 | |
| 4 | |
| 5 |
Which is the heaviest thing you have seen?
Now imagine what happened next and complete the story. Discuss with your friends how Vaidika’s daughter found the weight of the elephant.
Have you ever been to a post office?
What different things do people go there for?
| 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?
 |
 |
 |
