exam Maths Puzzle Numerical Ability

Can you help me solve:

3b-a=-7
5a+6b=14

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exam Other Question

Suppose a chemist is mixing two acid solutions, one of 20% concentration and the other of 30% concentration.Which one of the following concentrations could not be obtaioned?

A. 22% B. 24% C. 28% D. 32% The factors of x^2(y-z)+y^2(z-x)+z^2(x-y)
(a) (x+y+z)(xy+yz+zx) (b) (x-y)(y-z)(z-x)
(c) (x-y-z)(xy-yz-zx) (d) (x-y)(y-z)(x-z)