exam Maths Puzzle Numerical Ability

According to recycling recirds kept by the Evironmental Protection Agency 38% of postconsumer newsprint was recycled in 1990, 45% in 1992, 47% in 1994, and 60% in 2001. The least-s

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5x-y+z=-3
2x+2y-3z=-23
x-3y+2z=14

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Helen Weller invested $15,000 in an account that pays 12% simple interest. How much additional money must be invested in an account that pays 15% simple interest so that the total