A watch was on sale for 70% off. The sale price is $60. What was the original price?

$85.71

Step-by-step explanation:

The watch's original price was $85.71

y=p%*x

x=y/p%

x=60/70%

x=60/0.7

x=85.7143

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answer: the two figures are congruent.

step-by-step explanation: they're congruent because figure efgh is reflected across the x and y axis but it was also rotated.

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reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.