NTPC CBT- 2 MOST PROBABLE -RATIO AND PROPORTION QUIZ-11

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Question 1:

The students in three classes are in the ratio $4: 6: 9 .$ If 12 students are increased in each class, the ratio changes to $7: 9: 12 .$ Then the total number of students in the three classes before the increase is :

Question 2:

An employer reduces the number of employees in the ratio $8: 5$ and increases their wages in the ratio $7: 9$. As a result, the overall wages bill is:

Question 3:

465 coins consists of 1 rupee, 50 paise and 25 paise coins. Their values are in the ratio $5: 3: 1 .$ The number of each type of coins respectively is:

Question 4:

A sum of Rs. 350 made up of 110 coins which are either Re. 1 or Rs. 5 denominations. How many coins are of Rs. $5 ?$

Question 5:

If $\mathrm{A}: \mathrm{B}=\frac{1}{3}: \frac{3}{8}, \mathrm{~B}: \mathrm{C}=\frac{1}{3}: \frac{5}{9}$ and $\mathrm{C}: \mathrm{D}=\frac{1}{3}: \frac{5}{9}$, then ratio A: B: C: D is

Question 6:

Three students $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$ play cricket. The runs scored by $\mathrm{A}$ and $\mathrm{B}$ respectively are in the ratio $3: 2 .$ B's runs to C's runs are also in the same ratio. Together they score 342 runs. Then the runs scored by $\mathrm{B}$ are:

Question 7:

The monthly salaries of $A$ and $B$ are the same. $A$, $B$ and $C$ donate $10 \%$, $8 \%$ and $9 \%$ of their monthly salaries to a charitable trust respectively. The difference between the donations of $A$ and $B$ is $₹ 400$. The total donation by $A$ and $B$ is $₹ 900$ more than that of $C$. What is the monthly salary of C?

Question 8:

When $x$ is subtracted from each of $19,28,55$ and $91$ , the numbers so obtained in this order, are in proportion. What is the mean proportional between $(x+9)$ and $x^{2}$ ?

Question 9:

The marks of 3 students $A, B$ and $C$ are in the ratio $10: 12: 15 .$ If the maximum marks of the paper are 100, then the marks of $\mathrm{B}$ cannot be in the range of:

Question 10:

The sum of three numbers is $280$ . If the ratio between the first and second numbers is $2: 3$ and the ratio between second and third numbers is $4: 5$, then find the second number.