exam Maths Puzzle Numerical Ability

A chemist mixed a 20% acid solution with a 60% acid solution to make 10 L of a 30% solution. How many liters of the 60% solution were used?

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exam Other Question

17. -12 - w + 20

For the given expression:
I have to identify the terms,like terms,coefficients,and constant terms.
Then simplify the equation.

Help</b> with this question would be greatly appreciated:) EVALUATE EACH EXPRESSION: 7P3