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Question

Three numbers are in ratio $11 : 16 : 23$. If their sum is $150$, find the greatest number.

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
69

Ratio Calculation: Finding the Greatest Number

The problem asks us to find the greatest number among three numbers that are in a specific ratio and have a given sum.

Representing the Numbers

Let the three numbers be represented using the given ratio $11 : 16 : 23$. We can denote these numbers as $11x$, $16x$, and $23x$, where '$x$' is a common multiplier.

Using the Sum to Find the Multiplier

We are given that the sum of these three numbers is $150$. Therefore, we can set up the equation:

$11x + 16x + 23x = 150$

First, sum the coefficients of '$x$':

$ (11 + 16 + 23)x = 150 $

$ 50x = 150 $

Now, solve for '$x$' by dividing both sides by $50$:

$ x = \frac{150}{50} $

$ x = 3 $

Calculating the Greatest Number

The three numbers are $11x$, $16x$, and $23x$. The greatest number corresponds to the largest part of the ratio, which is $23$. To find the value of the greatest number, substitute the value of '$x$' ($x=3$) into the expression for the greatest number:

Greatest Number = $23x$

Greatest Number = $23 \times 3$

Greatest Number = $69$

Thus, the greatest number among the three is $69$.

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Important Questions from Ratio and Proportion

  1. The cost of a diamond is directly proportional to the square of its weight. The cost of a 14 gm diamond is Rs. 2560. This diamond got broken down into two pieces in the ratio of 5 ∶ 9. How much loss percent is incurred due to this breakage ? (Correct to two decimal places)

  2. Atul purchased Bread costing Rs.20 and gave a 100 rupee note to the shopkeeper. The shopkeeper gave the balance money in coins of denomination Rs.2, Rs.5 and Rs.10. If these coins are in the ratio 5 ∶ 4 ∶ 1, then how many Rs.5 coins did the shopkeeper give?

  3. A person divides a certain amount among his three sons in the ratio of 3 ∶ 4 ∶ 5. If he had divided this amount in the ratio of 1/3,1/4,1/5, his son, who had got the lowest share earlier, would get Rs.1,188 more. Find the amount (in Rs).

  4. In a school 3/8 of the number of students are girls and the rest are boys. One-third of the number of boys are below 10 years and 2/3 the number if girls are also below 10 years. If the number of students of age 10 or more years is 260. then the number of boys in the school is:

  5. If a : b : c = \(\frac{1}{4} : \frac{1}{3} : \frac{1}{2}, \)  then  \( \ \frac{a}{b} : \frac{b}{c} : \frac{c}{a} = ?\)

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