exam Maths Puzzle Numerical Ability

Solve for n: L=a+(n-1)d

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exam Other Question

r^2-5r+6
------------ =?
r^2-4

this problem needs to be reduced completely. A dentist invested a portion of $15,000 in a 7% annual simple interest account and the remainder in a 6.5% annual simple interest government bond. The two investments earn $1020 in interest annually. How much was invested in each account?