Question : What is the third proportion of the numbers 15 and 30?
Option 1: 45
Option 2: 50
Option 3: 40
Option 4: 60
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Correct Answer: 60
Solution : The third proportion of two numbers $a$ and $b= \frac{b^2}{a}$ Substituting $a = 15$ and $b = 30$ into the formula, So, the third Proportion = $\frac{30^2}{15}$ = 60 Hence, the correct answer is 60.
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Question : The average of 20 numbers is 30 and that of the other 30 numbers is 50. What is the average of all the numbers?
Option 1: 42
Option 2: 47
Option 3: 44
Option 4: 45
Question : What will be the HCF of the following set of numbers: 30, 45, and 150?
Option 1: 16
Option 2: 15
Option 3: 30
Option 4: 20
Question : What is the value of 25 percent of 40 percent of $\frac{2}{7}$th of 2100?
Option 1: 40
Option 2: 60
Option 3: 50
Question : The two numbers are in the ratio of 5 : 3. If 9 is subtracted from each, then the new ratio is 9 : 5. What are the two numbers?
Option 1: 50 and 30
Option 2: 45 and 27
Option 3: 90 and 54
Option 4: 15 and 45
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