exam Maths Puzzle Numerical Ability

How many liters of a solution containing 22% sugar and how many liters of another solution containing 31% sugar must be mixed together to make 680 liters of solution containing 27% sugar?

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exam Other Question
To fly due north at 580 km/h with a 45 km/h blowing toward 130o, what speed and direction should the plane travel? Fm = qvBsin(theta)

solve for (v)

Can you divide Fm/qBsin(theta) to be left with just (v) on the right side?