exam Maths Puzzle Numerical Ability

Solve the rational equation

b+3/b + b+4/b+5 = 15/b^2+5b

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exam Other Question

Roberto invested some money at 7%, and then invested $2,000 more than twice his amount at 11%. His total annual income from the two investemnts was $3,990. How much was invested at 11%. Help please: Determine algebraically whether the lines are parallel, perpendicular or neither. State the number of solution.

x - y = 5
x = 5 - y