exam Maths Puzzle Numerical Ability

2a+5+5=20

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exam Other Question

i cant solve this problem because of lack knowing in solving this algebra problem 2^3 2^3
x^4 x
(4^4 y^7) (-5x^5y^2)
(4nx^5^n) (5nx^4^n)
(2^3)^2 Multiply, Using the vertical method. (m^2-5mn +3n^2)(m^2+4mn-2n^2)

I can not figure out the vertical method or may be I am making it harder than it really is. Thanks.