exam Maths Puzzle Numerical Ability

sum the series

1+4/6 + 4.5/6.9 + 4.5.6/6.9.12 + ................infinity

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exam Other Question

what are the values of w,x,y, and z in these equations?

1. w + x + y + z = 2
2. 2w - x - y +2z = 7
3. 2w + 3x + 2y - 2z = -2
4. 3w - 2x - y -3z = -2 Suppose $2500 is invested at 7.5% per year compounded quarterly. What is the amount after 5 years?