exam Maths Puzzle Numerical Ability

How many gallons each of 25% alcohol and 35% alcohol should be mixed to get 20 gallons of 32% alcohol?

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Can you help me with two problems? Thank you.
I think I know how but not really sure.


the data shows answers to a survey of " how many siblings do you have?"
organize and pl
The sum of the digits of a two-digit number is 12. The number formed by interchanging the digits is 54 more than the orginal number. find the original number and its reversal.


thank you