exam Maths Puzzle Numerical Ability

solve these equation
1.2
2.4

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exam Other Question

Use square roots or factoring to solve the equation.

1/3(x+2)^2= 3/4 One grade of oil has 0.50% of an additive, and a higher grade has 0.75% of the additive. How many liters of each must be used to have 1000 L of a mixture with 0.65% of the additive.