exam Maths Puzzle Numerical Ability

a grocer mixes cookies worth 80 cents a kg with cookies worth 95 cents a kg making a mixture selling at 85 cents a kg. If he mixes 60 kilograms , how many kilograms of each kind does he use?

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exam Other Question

Combinations of 23 cents and 32 cents stamps can be used for 55 cents and 78 cents postage and many other amounts. But no combination of 23 cents and 32 cents stamps can be used to Sketch the polynomial and identify all intercepts, zeros, and asymptotes:
P(x)=(x^2+x+2)/2x-1
Thanks in advance!