exam Maths Puzzle Numerical Ability

graph y=3x-2

y=2/5x+1

6x+3y=15

x=-3

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exam Other Question

(2^2x5y-3z^4/4^0x-2y-8z^5)3 What is the missing number in the sequence? 1/8,1/4,?,5/8... Cant see to find the number