Statement Sums involving Ratios


 
 
Concept Explanation
 

Statement Sums involving Ratios

Statement Sums involving Ratios:

Ratio problems: Two-term Ratios

Example 1:

In a bag of red and green sweets, the ratio of red sweets to green sweets is 3:4. If the bag contains 120 green sweets, how many red sweets are there?

Solution:

Step 1: Assign variables :

Let x = red sweets

Write the items in the ratio as a fraction.ratio problem

Step 2: Solve the equation

Cross Multiply

3 × 120 = 4 × x360 = 4x

Isolate variable xx=360/4

Answer: There are 90 red sweets.

Example 2:

John has 30 marbles, 18 of which are red and 12 of which are blue. Jane has 20 marbles, all of them either red or blue. If the ratio of the red marbles to the blue marbles is the same for both John and Jane, then John has how many more blue marbles than Jane?

Solution:

Step 1: Sentence: Jane has 20 marbles, all of them either red or blue.

Assign variables:

Let x = blue marbles for Jane20 – x = red marbles for Jane

We get the ratio from JohnJohn has 30 marbles, 18 of which are red and 12 of which are blue.red/blue

We use the same ratio for Jane.red/blue

Step 2: Solve the equation

Cross Multiply

3 × x = 2 × (20 – x)3x = 40 – 2x

Isolate variable x

x=40/5

John has 12 blue marbles. So, he has 12 – 8 = 4 more blue marbles than Jane.

Answer: John has 4 more blue marbles than Jane.

Sample Questions
(More Questions for each concept available in Login)
Question : 1

The monthly incomes of A and B are in the ratio of 3 : 2 and their expenditures are in the ratio of 5:3. Each saves As. 1000 per month. Find the incomes of A and B.

Right Option : A
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Question : 2

A train took "X hours" to reach destination A from point X and "Y hours" to reach destination B from point A. What is the ratio of time taken by the train to reach destination B from A to the total time taken by the train to reach destination B from point X ?

Right Option : D
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Explanation
Question : 3

Two numbers are in the ratio 6:5. If one number is 240 then find the other.

Right Option : B
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Explanation
 
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