exam Maths Puzzle Numerical Ability

y-99=-18

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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? If angle RTS = 8x + 18, find x so that TR is congruent to TS