exam Maths Puzzle Numerical Ability

Use the substitution method to solve the linear system.

y = x - 4
4x+y = 26

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exam Other Question

find x
-3log(x+2)+log5=0

The answer is -2+cube root of 5

What steps are involved in getting to that answer? Emilio and Rose sell half of their book collection at a garage sale. They donate 1/5 of the remaining books to a resale shop and keep 40 books. How many books did they have to start with?