book Maths Puzzle Numerical Ability

ax+by=c solve for y

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book Other Question

Can someone just tell me if I am right? If 30 cents out of every 1 dollar goes to taxes, and the rest is net income, what is the ratio of taxes to net income?
I think the answer 3:7. Is that right? Change the radical to simplest radical form:

SQRT of 19/4