exam Maths Puzzle Numerical Ability

It is estimated that at the present rate of deforestation in El Salvador, in 20 years only 53% of the present forest will remain. How long will it take to remove 95% of the forest?

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9x-5y=30 which is the slope and which is the y-intercept???????? help a bag contains a total of 20 balls. 6 are white, 3 are red and the rest are blue. if one ball is drawn from the bag, what is the probability that it is blue.