book Maths Puzzle Numerical Ability

What percent of 4,292 is 5,365?

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book Other Question

Please help me find the GCF of (6y2-3y)(y+7).

I am not sure if I did this right, the answer I come up with is
y(6y-3)(y+7)
y is the GCF find the exact value using the sum, difference, half, or double angle formulas and the exact value char in cos 105 degrees.