book Maths Puzzle Numerical Ability

(8+7)(4)=n(4) what is the property used?

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Could you help me solve these linear inequalities by grahing?

5x+8y=48 6-y=(5x)/(8) two circles each of radius 5cms intersect each other. if the distance between their centres is 5 root 2 cms, find the area of the portion common to the two circles.