book Maths Puzzle Numerical Ability

z-12=6 how do I work this out

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A pediatrician prescribed 10ml per day of medication for a 30-pound child. The next patient weighed 50 pounds and was prescribed 20 ml per day. Find a linear equation for prescri John Page invested 11000 in an account that pays 12 percent simple interest. How much additional money must be invested in an account that pays 15 percernt simple interest so that the average return on two investments amounts to 13 percent?