if ratio of 49 and number is same as ratio of that number and 81.find the number? ans:63
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plz tell me answer in my method the answer is 42
ratanhuidrom:
63
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3
Here is the solution :
Let the number be x,
Now,
According to the Question,
49:x = x:81,
We know that, a:b = a/b,
=> 49/x = x/81,
Cross Multiplying,
=> x*x = 49*81,
=> x² = 49*81
=> x = √(49*81)
=> x = √(7*7*9*9)
=> x = √(7²*9²)
=> x = ±7*9
=> x = ±63
=> x = Either +63 or -63,
Therefore : The answer is ±63 (It can be + or -)
Hope you understand, Have a Great day,
Thanking you, Bunti 360 !..
Let the number be x,
Now,
According to the Question,
49:x = x:81,
We know that, a:b = a/b,
=> 49/x = x/81,
Cross Multiplying,
=> x*x = 49*81,
=> x² = 49*81
=> x = √(49*81)
=> x = √(7*7*9*9)
=> x = √(7²*9²)
=> x = ±7*9
=> x = ±63
=> x = Either +63 or -63,
Therefore : The answer is ±63 (It can be + or -)
Hope you understand, Have a Great day,
Thanking you, Bunti 360 !..
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