(2n – 4)90 = (2 x 8 – 4)90 = 10800
2 x ½x + x +40 + 110 + 135 +160 + 2x + 10 + 185 = 1080
5 ½x = 440
x = 800
Kavungya answered the question on September 30, 2019 at 06:15
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