exam Maths Puzzle Numerical Ability

(x-4)/2-1/5=(7x+1)/20
solve for x

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exam Other Question

{A, B, C, D} AND P(A) = 0.1, P(B) = 0.3, P(C) = 0.4, P({A,C})=

a. 0.4
b. 0.5
c. 0.6
d. 0.8 Simplify (-2a^2 b^3)^2/(2a^2 b)^3