book Maths Puzzle Numerical Ability

y=3/4x

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book Other Question

use synthetic division to divide the following polynomials:
1) divide 3x^5+13x^4+12x-1 by x+5
2) divide 3x^3-8x^2-20x by x+5
A pharmacist mixed some 10%-saline solution with some 15%-saline solution to obtain 100 mL of a 12%-saline solution. How much of the 10%-saline solution did the pharmacist use in the mixture?