A scientist takes a calf muscle biopsy from an astronaut before the astronaut rockets into space. He determines that the muscle has 140 units of power. After six months in space, the astronaut returns to Earth where the scientist finds that the astronaut lost 40% of the power in her calf muscle. How many units of power did the astronaut have in her calf muscle upon her return to Earth?

Explanation:

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a hue is a character or aspect.

the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).