exam Maths Puzzle Numerical Ability

write 0.235 as a fraction or mixed number simplest form

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exam Other Question

(2,y),(4,5),m=2 How many liters of pure antifreeze must be added to 20 liters of a solution that is 25% antifreeze to obtain a 50% solution? Tried using the given formula from teacher but get a negative 10 answer??
.25(20)= .50(20+x)