exam Maths Puzzle Numerical Ability

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7X+5Y=23
3X-Y=4

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This problem has been bothering me for a while now. I need help on how to solve it. It goes like this: If f(x)= 1-3x and g(x)= 1/ x^2 +1, find f(g(0)) and g(f(1)) A CERTAIN WATER LILY GREW EXTREMELY QUICKLY AND DOUBLED ITS SURFACE AREA EACH DAY. AT THE END OF THE 13th DAY, IT HAD ENTIRELY COVERED THE POND IN WHICH IT LIVED. IF A SENCOND WATE