EK Physics lecture 3 question 305

[howyoudoin]

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I am getting .3 I can not understand how they got the answer .4

 

[TwoPaddles]

I am getting .3 I can not understand how they got the answer .4

x4g = (0.5-x)(16)g
cancel g on both side
4x = (0.5-x)(16)
distribute
4x = 8 - 16x
solve for x
x = 0.4