1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Tresset [83]
3 years ago
9

You have 12 coins, one of which is fake. The fake coin is indistinguishable from the rest except that it is heavier. Can you det

ermine which is the fake coin heavier using a balance scale and only 3 weighings?

Mathematics
2 answers:
Anton [14]3 years ago
5 0
Yep! 
Weighing #1: Start off by splitting the pile of 12 coins evenly into two piles, 6 in each pile. Put one pile on each side of the balance. The side that is weighed down has the fake coin it in. Ignore the other 6 coins.

Weighing #2: Now you have 6 coins left. Split the pile evenly again, 3 in each pile. Repeat the same process and put each pile on one side of the balance. The side that is weighed down has your fake coin in it. Ignore the other 3 coins.

Weighing #3: You have 3 coins left. Take two coins, whichever two you like, and weigh them. If they weigh the same, then the one you didn't weigh is the fake one. If one is heavier, then that heavier one is your fake coin.
KATRIN_1 [288]3 years ago
3 0
1) Divide 12 coins into 6 6
The heavier side contain the fake coin

2)Divide the 6 coins left by 3,you will get 2 coins per groups
Just put TWO groups of coins on the balance and keep the third group aside

**If two sides of the balance are balance,it means that the third group contain fake coin**
**If one side is heavier,that 2 coins contain fake coin**

3)Directly put the chosen 2 coins on each side and you can find out which is the fake one!

You might be interested in
Marisol buys 3 notebooks that each cost the same amount and 1 calculator that costs $9. The total cost is $21. How much does eac
adoni [48]

Answer: 4 dollars for each notebook

Step-by-step explanation:

21-9= 12

12/3=4

each notebooks costs 4 dollars

4 0
3 years ago
Read 2 more answers
There are 275 people in a movie theater. Of those, 150 are adults. What is the ratio of
Alexxandr [17]

Answer:

270 to 150

Step-by-step explanation:

 

3 0
3 years ago
Read 2 more answers
The members of the basketball team ordered 5 tuna sandwiches at $3.99 each, 5 fish tacos at $2.75 each, 3 salads at $2.70 each,
Oliga [24]

Firstly, $3.99 × 5 = $19.95

Second, $2.75 × 5 = $13.75

Third, $2.70 × 3 = $8.1 (Since it is just $8.1 that won't make sense so we'd add a 0 so It's $8.10.)

Then we do the last one which is 13 × $0.89 = $11.57.

So now since we are done multiplying we can add it all up.

The answer is $53.37 when we finish adding it up.

and I don't know what A number sentence is sorry :(

I took a long time typing this :< I hope this helps though! :D

7 0
3 years ago
Please help me with this.
Scorpion4ik [409]

Answer:

Step-by-step explanation:

7 0
2 years ago
Sketch the image of quadrilateral PQRS under the following dilations:
kramer

Answer:

dam this been up for a long time

Step-by-step explanation:

its just too hard sorry man

7 0
3 years ago
Other questions:
  • 2.5 + 0.5k=2(k + 0.5)
    10·2 answers
  • What is the value of x. In circle a bae = dae
    5·2 answers
  • Bridget measured a restaurant and made a scale drawing. The restaurant’s kitchen is 6 millimeters long in the drawing. The actua
    10·1 answer
  • WRITE IN STANDARD FORM. <br><br><br> 3z - 9z^3 - 8z^5 + 2z^2
    6·2 answers
  • Please help me with questions 5, 6, and 7
    7·1 answer
  • Combine like terms.<br> -5y - 5x + 5y + 5y - x + 2 - 2
    8·1 answer
  • A. one solution <br> B. infinitely many solutions <br> C. no solution
    6·1 answer
  • Use the points to describe the data and determine the line of best fit.
    12·1 answer
  • In the statement
    13·1 answer
  • The graph of a quadratic function passing through the point (1,-4) has its turning point at (-2,5). Write down the equation of t
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!