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Ans 1:
Class : Class 10
There was a minus sign in between which was missing. It has been corrected.
First Number = 84000+6000+150 = 90150
Second Number = 16000+ 8200 + 280 + 19 = 24499
Difference = 90150 - 24499 = 65651
First Number = 84000+6000+150 = 90150
Second Number = 16000+ 8200 + 280 + 19 = 24499
Difference = 90150 - 24499 = 65651
Ans 3:
Class : Class 7
The correct answer is 'B'. As you have been asked -
84 thousands 60 hundreds 50 tens = 90,150
16 thousands 82 hundreds 28 tens 19 ones = 24,499
Now over here we have not been given an equation symbol.
So, we assume that 90,150 - 24,999 = 65,651
Therefore the answer is 'B: 65,651'
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Ans 2:
Class : Class 9
Quantity of mixture = 400 ml.
Quantity of pure alcohol in it
= 15 % of 400
= 15/100 * 400
= 60 ml
Let's consider 'x ml' of pure alcohol was added to the mixture.
After adding,
Quantity of mixture = (400 + x) ml
Quantity of pure alcohol in it = (60 + x) ml
Strength
= (60 + x)/(400 + x) = 32/100
=> 100(60 + x) = 32(400 + x)
=> 6000 + 100x = 12800 + 32x
=> 100x - 32x = 12800 - 6000
=> 68x = 6800
=> x = 6800/68
=> x = 100
Hence answer is 100 ml