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How can you find the ball that is heavier by using a balance and only two weighings?
If the left side is heavier, then we know that one of 1, 2 or 3 is the heavier ball. Weigh {1} on the left and {2} on the right. By doing this, we will know if 1 or 2 is heavier. If they balance out, then 3 is the heavier one.
What is the fewest number of weighings You need to find the odd ball out?
Weigh A and B. Then weigh A and C. If D is the odd ball you will know this after the second weighing, because A, B, and C were all equal, but if you need to know whether it’s lighter or heavier you cannot escape a third weighing. If it’s enough to know which is different, two weighings are enough.
How do you find the heavier ball from 9 balls?
Split the balls into groups of three, compare two of the groups. If the sets balance then the heavy ball is in the third group, otherwise it is in the group left out. Whichever it is, take two balls from that group to weigh. If they balance, you know it is the third ball, if they don’t, you have the heavier ball.
Which ball is the heaviest?
Sport Ball Weights, Sorted from Lightest to Heaviest
sport | weight (ounces) | weight (grams) |
---|---|---|
Basketball | 22 | 623.7 |
Pétanque | 24 to 28.2 (1.5- to 1.75 lbs) | 680 to 800 |
Bocce | 32 | 920 |
Bowling | 256 oz (16 lb) | 7.26 kg |
What is a two sided scale?
A double-pan balance is a scale which has 2 pans that are balanced against each other. The scale functions like a see-saw, with each of the 2 pans attached to a beam over a centered pivot point.
How will you weigh 9 marbles 3 times on a balance scale to choose the heaviest one?
Interview Answers Dive them to three groups that each group consists three marbles. Balance the first two groups. If they are equal than the heavier marble is in the third group otherwise you can understand the heavier marble is in the group which is heavier.
Which is heavier a golf ball or a tennis ball?
According to the Rules of Golf (as approved by the United States Golf Association and the Rules Committee of the Royal and Ancient Golf Club of Saint Andrews), golf balls must weigh no more than 45.93 g. Per International Tennis Federation standard, regulation tennis balls must weigh about 56.0 g to 59.4 g.
How many green and red balls are there in a bag?
A bag A contains 4 green and 6 red balls. Another bag B contains 3 green and 4 red balls. If one ball is drawn from each bag, find the probability that both are green. 10). A bag contains 13 white and 7 black balls, Two balls are drawn at random.
How do you find the weight of a heavy ball?
Answer: Let’s label the balls R1, R2 (Red ones), G1, G2 (Green ones) and Y1, Y2 (Yellow ones). First weigh R1, G1 on one side and R2, Y1 on the other. If they are equal, we know that one of G1 or Y1 is heavy.
How many combinations can you make with 3 red balls?
The number of combinations is of course 4!; similarly, for the blue balls the number is 5!. I’m sure you can see how this can be easily extended if we also have 3 red balls too.
How do you know if y1 is heavy or light?
If G2, Y2 is heavy, G2 and Y2 are both heavy. The heavier set is {R1, G2, Y2}. If R2, Y1 is heavy, we know that either Y1 is heavy or G1 is light. This is similar to the case above.