exam Maths Puzzle Numerical Ability

A 4% salt solution is mixed with a 16% salt solution. How many milliliters of each solution are needed to obtain 600 millilters of a 10% solution?

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exam Other Question

find the vertical asymtotes, f any, of the graph of the rational function.

f(x)=x/x^2+4
a. x=-4,x=4
b. x=4
c. x=-4
d. no vertical asymptote Can someone help me with this problem?

How do you write 1/8 as a percent.

Thanks,
Sher