book Maths Puzzle Numerical Ability

how many years will it atke $6000 invested at 8% interest to earn $1680

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book Other Question

solve using the addition method.

#1

x+y=4
2x-y=5

#2

x+2y=9
3x-2y=-5

#3

x-y=8
2x+y=7

#4

2x+3y=-5
3x-y=-13

#5

2x+3y=8
5x+2y=-2

#6

5x-2y=2
3x 2 x + 5y = 10