exam Maths Puzzle Numerical Ability



A picture measuring 40cm by 60cm is surrounded by a frame of uniform width. If the area of the frame equals the area of the picture,then what is the width of the frame ?
Please help me :)

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exam Other Question
The remainder when x+3 divides x^4+7x^3-15x^2-8x+m is 23. find the value of m.
could you explain step by step the procedure?
thanks Can you please help me solve?
2x-3y=13
x+y=-1

2x-3y=13
3x+3y=-3
--------
5x=12
x=12/5
= 2.4

x+y=-1
2.4+y=-1
y=-1-12/5
=-17/5