The length of the log is 6.4 meters. First sawed off 3/8 of the log, and then 0.6 of the remainder. Find the length of the remaining part of the log after this.
X – log length
Y – length of the remaining part
From the conditions of the task, we compose an expression:
Y = X-X * 3 / 8-0.6 * (X-X * 3/8)
Y = X * 5 / 8-0.6 * X * 5/8
Y = 0.4 * X * 5/8 = X * 2/8 = X / 4 = 6.4/4 = 1.6 meters – the length of the remaining part
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