exam Maths Puzzle Numerical Ability

2 students have 210 $altogether. If the first one gives 1/6 of his sum of money to the second one ,the second one will have 1/2 of the sum the remains to the firdt one . What some

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Can you please help with this one?
(16 - x2)/
(x3 - 2x2 - 8x)
So far I have:
(4-x)(4+x) over
x(x+2)(x-4)
Do this look right and is it as far as I can go? Which of the following exponential functions best describes the table below?
x: -0.1, 0 , 0.1 , 0.2
y: 6, 3, 1.5, 0.75
a) y=6(1/2)^10x
b) y=3(1/2)^x/10
c) y=3(1/2)^10x
d) y=3