exam Maths Puzzle Numerical Ability

. How many pints of a 9% cleaning solution must be mixed with 10 pints of a 13%
cleaning solution to give a 11% solution?

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exam Other Question

Cesium 13 is a radioactive element with a half life of 30 years. Predict how much of a 60mg sample of cesium137 would remain after 210 years. I am trying to figure out the formula to solve this Thanks x+y=5
3x-y=7