exam Maths Puzzle Numerical Ability

A man deposited $6800 into two accounts. One account earns interest at 8% and the other at 10.5%. The total interest for one year is $669. Find the amount deposited in each account.

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Graph the function with equation y= ab(2x-30) and how would I use the graph to find the values of x for which ab(2x-3)< 5 The length of a rectangle is three times the width. If the length is increased by 4 feet and the width is decreased by 1 foot, the area will be increased by 24 square feet. What are the dimensions of the original rectangle?