Ratio and Proportion
The given problem is based upon calculating the number of marbles in jars of specific color, to do so we have to use ratios of the marbles of different colors and use the ratio to calculate the actual number of marbles of required color.
Try the problem
Two jars each contain the same number of marbles, and every marble is either blue or green. In Jar $1$ the ratio of blue to green marbles is $9:1$, and the ratio of blue to green marbles in Jar $2$ is $8:1$. There are $95$ green marbles in all. How many more blue marbles are in Jar $1$ than in Jar $2$?
$\textbf{(A) } 5\qquad\textbf{(B) } 10 \qquad\textbf{(C) }25 \qquad\textbf{(D) } 45 \qquad \textbf{(E) } 50$
2019 AMC 10B Problem 11
Ratio and proportion
6 out of 10
Secrets in Inequalities.
Knowledge Graph
Use some hints
First hint
Let \(2x\) is the total no of marbles in both the jars. so each of the jar have \(x\) marbles.
Thus, $\frac{x}{10}$ is the number of green marbles in Jar $1$, and $\frac{x}{9}$ is the number of green marbles in Jar $2$.
Since $\frac{x}{9}+\frac{x}{10}=\frac{19x}{90}$, we have $\frac{19x}{90}=95$, so there are $x=450$ marbles in each jar.
Second Hint
Since \(\frac{9}{10}th\) of the jar 1 marbles are of blue color and \(\frac{8}{9}th\) of the jar 2 marbles are of blue color.
Final Step
Now we can easily find the no of blue marbles in both the jars and then we can subtract them to get the amount by which one exceed the other.
Other useful links
- https://www.cheenta.com/consecutive-terms-of-a-series-b-stat-hons-2003-problem-1/
- https://www.youtube.com/watch?v=ST58GTF95t4
Related Program
I.S.I. & C.M.I. Entrance Program
Taught by students and alumni of I.S.I. & C.M.I.