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.
Advertisements
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
Now, you also make your own balance. Write down how you made it. Also draw a picture of your balance in the box below.
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 heavier? One kilogram cotton or one kilogram iron?
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?
Guess which is the heaviest-a real car, a bus or a tractor?
How much does an inland letter cost?
A frog was struggling to escape from the mouth of a crow. How can I escape? The frog thought. Suddenly a trick came to his mind. He asked the crow-Are you good at arithmetic? If yes, then I will ask you a problem.
Your weight is 650 g and I am only 145 g. How much do we weigh together? The crow was good at mathematics, so he happily opened his beak to answer.
What happened after that? So what was the answer the crow wanted to give?
The chart shows the height and weight of children between 6 and 10 years old.
| Name | Age | Height | Weight |
| Temshula | 6 | 3 feet, 7 inches | 16 kg |
| Sreekunth | 10 | 4 feet, 3 inches | 23 kg |
| Rabiya | 6 | 3 feet, 10 inches | 17 kg |
| Vineet | 8 | 3 feet, 11 inches | 19.5 kg |
| Kavita | 9 | 3 feet, 10 inches | 20 kg |
Now, you also fill the table by finding out the age, height and weight of any five friends.
