Question : The ratio of three numbers is 3 : 6 : 8. If their product is 9216, then what is the sum of the three numbers?
Option 1: 96
Option 2: 72
Option 3: 144
Option 4: 68
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Correct Answer: 68
Solution : Given: The ratio of three numbers is 3 : 6 : 8. Their product is 9216. Let the numbers be $3k, 6k$, and $8k$. Product of $3k × 6k × 8k = 9216$ ⇒ $144k^{3}=9216$ ⇒ $k^{3}=\frac{9216}{144}$ ⇒ $k=\sqrt[3]{64}$ ⇒ $k=4$ The sum of the numbers $=3k+ 6k+8k=17k= 17 × 4 = 68$ Hence, the correct answer is 68.
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Question : Three numbers are such that their sum is 50, the product is 3750 and the sum of their reciprocals is $\frac{31}{150}$. Find the sum of the squares of the three numbers.
Option 1: $2500$
Option 2: $1250$
Option 3: $950$
Option 4: $122$
Question : The ratio of three numbers is 2 : 3 : 5. If the sum of the three numbers is 275, then what is the largest among the three numbers?
Option 1: 142
Option 2: 82.5
Option 3: 137.5
Option 4: 152
Question : The ratio of three positive numbers is 2 : 3 : 5 and the sum of their squares is 608. The three numbers are:
Option 1: 2, 3 and 5
Option 2: 10, 15 and 25
Option 3: 8, 12 and 20
Option 4: 4, 6 and 10
Question : If the sum of three consecutive composite numbers is 36, then what is the product of the three numbers?
Option 1: 1460
Option 2: 1750
Option 3: 1680
Option 4: 1820
Question : If the sum of squares of two real numbers is 12 and the product of the numbers is 4, find the difference between the numbers.
Option 1: 4
Option 2: 8
Option 3: 1
Option 4: 2
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