book Maths Puzzle Numerical Ability

How would you solve for R in this equation:
(.85)(1+R)^5 -.15 = (1+.75R)^5
3.15
Thanks.

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book Other Question

a box contain 6 choclates,the mass of the box &choclate is 200 gm.Find the mass of one choclate.Determine the mass of the box.Let B grams represent the mass of a box containing N c h=192+64t-16t^2 tells the height in feet of a stone t seconds after it is thrown from the top of the building.
a.) what is the height of the stone after three seconds?
b.) At wha