exam Maths Puzzle Numerical Ability

What steps do you take to solve r=p(220-a) for the variable "a"?

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exam Other Question

y=1/3x+3
y=1-3x-3 (3)A 100% concetrate is to be mixed with a mixture having a concentrate of 40% to obtain 55 gallons of a mixture with a concentrate of 75%. how much of the 100% concentrate will be needed?