NTPC CBT- 2 MOST PROBABLE -RATIO AND PROPORTION QUIZ-17

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Question 1:

When $x$ is subtracted from each of $18,25,28$ and $42$ , the numbers so obtained in this order are in proportion. What is the value of $\mathrm{x}$ ?

Question 2:

Seven years ago, the ratio of the ages of A and B was 5: 4. Eight years hence, the ratio of the ages of A and B will be 10 : 9. What is the sum of their present ages?

Question 3:

A box containing the denominations of one rupees coins, 2rupee coins and 5 rupee coins amount to Rs. 1872. There are equal number of coins in all denominations. How many number of coins in the box ?

Question 4:

If $2 x+1, x+2,2$ and 5 are in proportion, then what is the mean proportional between 3.5(1-x) and 8(1+x)?

Question 5:

The ratio of boys and girls in a group is 7 : 6 . If 4 more boys join the group and 3 girls leave the group, then the ratio of boys to girls becomes $4: 3$. What is the total number of boys and girls initially in the group ?

Question 6:

If $11 \mathrm{~A}=13 \mathrm{~B}=17 \mathrm{C}$ then the ratio of $A: B: C$ is:

Question 7:

The monthly incomes of Amit and Bandana are in the ratio $4: 5$, their expenses are in the ratio 5: 6. If ' Amit ' saves Rs. 25 per month and ' Bandana ' saves Rs.50 per month, what are their respective incomes?

Question 8:

The proportion of milk and water in 3 samples is 2: 1,3:2 and 5: 3. A mixture comprising of equal quantities of all 3 samples is made. The proportion of milk and water in the mixture is.

Question 9:

$A$, $B$ and $C$ play cricket. A's runs ratio are to B's runs and B's runs are to C's as $3: 2$. They get altogether 342 runs. How many runs did A make?

Question 10:

A fort has provisions for 60 days. If after 15 days 500 more men join them and the food lasts for 5 days less, At the beginning, how many men were there in the fort ?