exam Maths Puzzle Numerical Ability

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

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exam Other Question

use elimination to solve each system of equations

2/3x-1/2y=14
5/6x-1/2y=18
How many gallons each of 25% alcohol and 35% alcohol should be mixed to get 20 gallons of 32% alcohol?