exam Maths Puzzle Numerical Ability

Solve the system by elimination method.

0.05x + 0.25 = 22,
0.15x + 0.05 = 24

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exam Other Question

Please help me solve.
I think I am suppose to use proportions to solve this problem.

I have a square. I know it is same all way around.
Problem state--------- x+3 for height a How do you write a quadratic equation with integer coefficients that could represent the following solution:

x = -1 and x = 3