exam Maths Puzzle Numerical Ability

solve. a) 1/4x+15- 1/x^2-9=5/x-3 b)sqrt of x+7 +sqrt of x+16=9

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If the deforestation of El Salvador continues at the current rate for 20 more years only 53% of the present forests will be left. If the decline of the forests is exponential, what A scoop of ice cream has a diameter of 4.2 cm. It is placed in a cone with a diameter of 4 cm. and a height of 6 cm. If the ice cream melts into the cone, will it overflow the cone?