1.

If the mean of (x+2),(x-5), 12 and 15 is 16 Find the value of x​

Answer»

Answer:

[(X + 2) + (x - 5) + 12 + 15] /4 = 16

[(x + 2) + (x - 5) + 12 + 15] = 16 * 4 = 64

(x + 2) + (x - 5) + 27 = 64

x + 2 + x - 5 = 64 - 27 = 37

2x - 3 = 37

2x = 37 + 3 = 40

x = 40/2 = 20

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