exam Maths Puzzle Numerical Ability

please help me to solve

Pencils cost 25 cents apiece. Pens cost 80 cents apiece. Susan spent $20 for a total of 36 pens and pencils. How many pencils did she buy?

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exam Other Question

One the graphed equation y=(x-3)(x-5)(x-a), what is the value of a? Solve by the elimination method.
3x + 4y = 3
6x + 8y = 6

Can someone please help me with this. I was doing really well with my work but now am stuck again. Help me please.