exam Maths Puzzle Numerical Ability

A Chemist ahs 25% and a 50% acid soultion. How much of each soultion should be used to form 200 ml of a 35% acid soultion.

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here is the question : by the way this is on a practice final don't know that it will be in the book though.

Use elementary row operations to write the matrix below in row ech A car that sold for $15,200 had a sales tax of $912. At the same rate, how much is the tax on a car that sells for $12,000?