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Question

The number of Hens, Ducks, and Goats in farm P are 65, 91 and 169, respectively. The total number of Hens, Ducks and Goats in a nearby farm Q is 416. The ratio of hens : ducks : goats in farm Q is 5 : 14 : 13. All the hens, ducks and goats are sent from farm Q to farm P.

The new ratio of hens : ducks : goats in farm P is ____________.

The correct answer is

10 : 21 : 26

This problem involves calculating the new ratio of animals in a farm after a transfer from another farm. We need to determine the initial animal counts, calculate the number of animals transferred, and then find the combined totals to establish the final ratio.

Farm P: Initial Animal Counts

Initially, Farm P has the following number of animals:

  • Hens: 65
  • Ducks: 91
  • Goats: 169

Farm Q: Determining Animal Numbers

Farm Q has a total of 416 animals (Hens, Ducks, and Goats) with their ratio given as 5 : 14 : 13. To find the exact number of each type of animal in Farm Q, we first sum the parts of the given ratio:

\(\text{Sum of ratio parts} = 5 + 14 + 13 = 32\)

Now, we divide the total number of animals in Farm Q by the sum of the ratio parts to find the value of one ratio unit:

\(\text{Value of one ratio unit} = \frac{\text{Total animals in Farm Q}}{\text{Sum of ratio parts}} = \frac{416}{32} = 13\)

Using this value, we can calculate the number of each type of animal in Farm Q:

  • Hens in Farm Q: \(5 \times 13 = 65\)
  • Ducks in Farm Q: \(14 \times 13 = 182\)
  • Goats in Farm Q: \(13 \times 13 = 169\)

Let's verify the total for Farm Q:

\(65 (\text{Hens}) + 182 (\text{Ducks}) + 169 (\text{Goats}) = 416\)

This matches the total given for Farm Q.

Transferring Animals: Farm Q to Farm P

All the hens, ducks, and goats from Farm Q are sent to Farm P. This means we need to add the number of animals from Farm Q to the initial number of animals in Farm P for each category.

Farm P: New Total Animal Counts

Now, let's calculate the new total number of Hens, Ducks, and Goats in Farm P after the transfer from Farm Q. We add the animals transferred from Farm Q to the initial count in Farm P for each category.

Animal Type Initial in Farm P Transferred from Farm Q New Total in Farm P
Hens 65 65 \(65 + 65 = 130\)
Ducks 91 182 \(91 + 182 = 273\)
Goats 169 169 \(169 + 169 = 338\)

So, the new number of animals in Farm P is: Hens = 130, Ducks = 273, Goats = 338.

Farm P: Simplifying the New Ratio

The new ratio of Hens : Ducks : Goats in Farm P is \(130 : 273 : 338\). To simplify this ratio, we need to find the greatest common divisor (GCD) of these three numbers.

Let's look for common factors. We know that the animals in Farm Q were multiples of 13. Let's check if 13 is a common factor for the new totals in Farm P:

  • For Hens: \(130 \div 13 = 10\)
  • For Ducks: \(273 \div 13 = 21\)
  • For Goats: \(338 \div 13 = 26\)

Since all three numbers are perfectly divisible by 13, the greatest common divisor (GCD) is 13.

Dividing each part of the ratio by 13, we get the simplified new ratio:

\(130 \div 13 : 273 \div 13 : 338 \div 13\)

\(10 : 21 : 26\)

Therefore, the new ratio of hens : ducks : goats in Farm P is 10 : 21 : 26.

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Important Questions from Numerical Estimation

  1. The number of digits you have to type to write all the page numbers of a book starting from I (first page) is 2019. What is the number of pages in that book?

  2. Two fair dice are thrown. The number of cases where the number appearing on the upper face of the first die is not less than that on the lower face of the second die is

  3. A person divided an amount of Rs. 100,000 into two parts and invested in two different schemes. In one he got 10% profit and in the other he got 12%. If the profit percentages are interchanged with these investments he would have got Rs.120 less. Find the ratio between his investments in the two schemes.

  4. S, M, E and F are working in shifts in a team to finish a project. M works with twice the efficiency of others but for half as many days as E worked. S and M have 6 hour shifts in a day, whereas E and F have 12 hours shifts. What is the ratio of contribution of M to contribution of E in the project?

  5. M and N start from the same location. M travels 10 km East and then 10 km North – East. N travels 5 km South and then 4 km South – East. What is the shortest distance (in km) between M and N at the end of their travel?

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