exam Maths Puzzle Numerical Ability

A number which when added to 1/4 of it self 20.What is the number

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exam Other Question

If 80 is increased by 120 percent, what is the resulting number? im not sure if this is the topic for it but how do you find or do standard form with integer coefficients?

what are coefficients? how do you find them?

example......
-4y + 6x + 7 = 0
y= -11x -4