book Maths Puzzle Numerical Ability

Question: Solve problem by using a proportion.

1. Student-teacher ratio. The student-teacher ratio for Washington High was reported to be 27.5 to 1. If there are 42 teachers, then how many students are there?

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book Other Question

PetStore pays wholesaler $1.00 for dog bed and sells it for $21.00. What is the mark up? 21-1=20, 20=(x)(1), 20/1=x, 0.200. The markup is 200%. Is this correct? How do you find the pattern of change in a graph for?

f(x)= -3x^2 - 50x + 4

f(x) = -x^2 + 5x - 3

f(x) = -6|x+3|

f(x) = |x+11|