I need help, I would like to know how to do this type of exercises

I need help, I would like to know how to do this type of exercises step by step
You have 5 milliliters of a drink that contains 72% sugar. How many milliliters of a drink containing 36% sugar needs to be added in order to have a final drink that is 48% sugar?

 
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If Solution A contains 19% hydrogen and Solution B contains 64% hydrogen

If Solution A contains 19% hydrogen and Solution B contains 64% hydrogen. How
much of each solution should be mixed in order to create 120 gallons of a solution that contains 49% hydrogen?

solution A=
SOLUTION b=

 
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If Drink A contains 81% sugar and Drink B contains 53% sugar

If Drink A contains 81% sugar and Drink B contains 53% sugar. How
much of each solution should be mixed in order to create 140 milliliters of a solution that contains 76% sugar?
solution A=
SOLUTION B=

 
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Find the equation of a line passing through the point (8, – 1) and parallel to the line y = 6.

Find the equation of a line passing through the point (8, – 1) and parallel to the line y = 6.

 
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