book Maths Puzzle Numerical Ability

Can anyone answer this?
Fifty students were asked their favorite season.Thirty saaid summer,15 said winter and the rest spring or fall.In a circle graph what would the measure of each central angle be?

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book Other Question

Solve the following system of linear inequalities by graphing.

3x + 4y ≤ 12
x + 3y ≤ 6
x ≥ 0
y ≥ 0

Thank You!!!
Factor the equation

10(y+7)-x(y+7)

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