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
What is the first step to finding the sum of 2/7 & 1/4 without a calculator?
Illusion [34]

Answer:

first get a common denominator  by multiplying 7 and 4 to get  28

28 is our common denominator here.

Step-by-step explanation:

We want to add the fractions   2/7 and 1/4

(2/7) * (4/4)   and    (1/4) * (7/7)

(2/7) * (4/4)   +   (1/4) * (7/7) =  8/28  + 7/28 = 15/28

8 0
3 years ago
Reduce to the lowest term: 30/40
natulia [17]

Answer:

3/4

Step-by-step explanation:

Reduce both the numerator and the denominator by 10, their greatest common factor.

6 0
3 years ago
At a local animal shelter last week, 1/4 of the pet adoptions placed cats into homes and 2/3 of the adoptions placed dogs. Hamst
Arada [10]

Answer:

B)5/12 Hope It Help

Step-by-step explanation:

Brainliest please

7 0
3 years ago
Read 2 more answers
Here are three diffrent recipes for orangey-pinapple juice. Two of these mixtures taste the same and one taste diffrent. Recipe
arsen [322]
Recipe 1 : 4 cups oj with 6 cups pineapple.....ratio of 4/6 reduces to 2/3

recipe 2 : 6 cups oj with 9 cups pineapple...ratio 6/9 reduces to 2/3

recipe 3 : 9 cups oj with 12 cups pineapple....ratio 9/12 reduces to 3/4

so recipe 1 and recipe 2 will taste the same because the ratios are the same...and recipe 3 will be the different tasting one because it has a different ratio mixture
8 0
3 years ago
25 hundredths in simplest form
IRISSAK [1]
.25 or 1/4 Is the simplest form
5 0
3 years ago
Read 2 more answers
Other questions:
  • -6(2n+5)=-114 what is the answer
    12·1 answer
  • Could some please help me with these two
    9·1 answer
  • Plz tell me this solution​
    5·2 answers
  • [Precalculus] Use trigonometric identities to express:
    13·1 answer
  • A roulette wheel is constructed so that the numbers can fall from 1 to 10 and the probability of falling a number (k + 1) is 2 t
    8·1 answer
  • If the number you are dividing is greater than the number you are dividing by, the answer will be less than one. type true or fa
    15·2 answers
  • Find p(-3) if p(x)= 4x^3 - 5x^2 + 7x - 10.
    8·1 answer
  • A tow truck company in Houston charges a $40 service call fee and an additional fee of $15 per mile that the vehicle is towed. W
    12·1 answer
  • Write a two-column proof.
    14·2 answers
  • If $200 is put in the bank and each year the account earns 5% simple interest,
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!