exam Maths Puzzle Numerical Ability

If the result of increasing a by 300% is b, then a is what percent of b?

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ok one more This one like that last has graphs that i can not copy and paste here for some reason. Any way here is what i can show you.
5) Find the equations for the horizontal an A candy shop mixes nuts worth $1.10 per pound with another variety worth $0.80 per pound in order to make 42 pounds of a mixture worth $0.90 per pound. How many pounds of each kind of nut should be used?