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July 24, 2014

July 24, 2014

Posted by **bianca** on Tuesday, February 22, 2011 at 7:19am.

To put this in algebriac equation would be

140+120=260*.80=208

120*97

208*97=111

120-X=81%

X=111

I know this is not a correct algebraic expression could you explain how to write this in correct algebraic expression. Thanks for your help

- algebra -
**Reiny**, Tuesday, February 22, 2011 at 9:10am.81(120) + x(140) = .80(260)

81(120) + 100x(140) = 80(260)

1400x = 11080

x = 11080/1400 = .7914

the student must earn 79% of 140 or 110.8 points in the second semester.

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