MHB There are z red marbles. How many green marbles are there?

  • Thread starter Thread starter Johnx1
  • Start date Start date
  • Tags Tags
    Green
Johnx1
Messages
48
Reaction score
0
In a container, there are some blue, red and green marbles. There are twice as many blue marbles as red marbles, and there are 3 more green marbles than blue marbles.

a) There are z red marbles. How many green marbles are there?

my answer: z + 2z + 6z = 9zb) There are 19 green marbles in the container. Find the number of red marbles.

my answer 19/3 = 6.3/2 = 3.2 red marbles.
 
Mathematics news on Phys.org
Johnx said:
In a container, there are some blue, red and green marbles. There are twice as many blue marbles as red marbles, and there are 3 more green marbles than blue marbles.

a) There are z red marbles. How many green marbles are there?

my answer: z + 2z + 6z = 9zb) There are 19 green marbles in the container. Find the number of red marbles.

my answer 19/3 = 6.3/2 = 3.2 red marbles.
I like my notation better. Sorry.

Say we have r red marbles. Then we have b = 2r blue marbles. Now, be careful. "there are 3 more green marbles than blue marbles." That means we have g = b + 3 green marbles, not 3 times b. So g = b + 3 = 2r + 3. (or 2z + 3.) Notice that this gives you an integer number of red marbles.

Can you finish it from here?

-Dan
 
topsquark said:
I like my notation better. Sorry.

Say we have r red marbles. Then we have b = 2r blue marbles. Now, be careful. "there are 3 more green marbles than blue marbles." That means we have g = b + 3 green marbles, not 3 times b. So g = b + 3 = 2r + 3. (or 2z + 3.) Notice that this gives you an integer number of red marbles.

Can you finish it from here?

-Dan

Your notations are great. I red it incorrect when it comes to the "more" part.

a ) 2z + 3

b) 2* 19 + 3 = 41
 
Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. In Dirac’s Principles of Quantum Mechanics published in 1930 he introduced a “convenient notation” he referred to as a “delta function” which he treated as a continuum analog to the discrete Kronecker delta. The Kronecker delta is simply the indexed components of the identity operator in matrix algebra Source: https://www.physicsforums.com/insights/what-exactly-is-diracs-delta-function/ by...
Fermat's Last Theorem has long been one of the most famous mathematical problems, and is now one of the most famous theorems. It simply states that the equation $$ a^n+b^n=c^n $$ has no solutions with positive integers if ##n>2.## It was named after Pierre de Fermat (1607-1665). The problem itself stems from the book Arithmetica by Diophantus of Alexandria. It gained popularity because Fermat noted in his copy "Cubum autem in duos cubos, aut quadratoquadratum in duos quadratoquadratos, et...
I'm interested to know whether the equation $$1 = 2 - \frac{1}{2 - \frac{1}{2 - \cdots}}$$ is true or not. It can be shown easily that if the continued fraction converges, it cannot converge to anything else than 1. It seems that if the continued fraction converges, the convergence is very slow. The apparent slowness of the convergence makes it difficult to estimate the presence of true convergence numerically. At the moment I don't know whether this converges or not.
Back
Top