exam Maths Puzzle Numerical Ability

solve the system by substitution

4x-4y=0
y=2x-5

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exam Other Question

Write an algebraic expression, an equation or an inequality.

The difference of 3 times a number x and 11 1. find the total number of selection of five letters for the letters of the word SUCCESS.
2. how many different arrangements of three balls in a row can be made from one red two