exam Maths Puzzle Numerical Ability

One brine solution contains 6% salt and another brine solution contains 2% salt. How many pints of each solution should be mixed to produce 48 pints of brine solution that is 5% salt?

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exam Other Question

1)You drop a pebble into a calm pond causing ripples of concentric circles. The radius r(in feet) of the outer ripple is give by r(t)=0.6t where t is time (in seconds) after the pe True or False: {[a, b^2] : a, b is an element of R}is a subspace of R^2. Please show ALL step so that I can do it myself next time. Thank you.