Exam Maths Puzzle Category

the operationis defined by x=2x-10 then (9) is

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*x=2X-10
*9=2*9-10=8
*9(*9)=2*8-10=6
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Exam Other Question

4,9,29,?,599,3599 If birth rate and death rate of a city is 10% each find population of the city after 2 years.current population of the city is 3000.
A. 3000
B. 2940
C. 3060
D.3630