At 9 A.M., a thermometer reading 70°F is taken outdoors where the temperature 15°F. At 9:05 A.M., the thermometer reading is 45°F. At 9:10 A.M., the thermometer taken back indoors where the temperature is fixed at 70°F. Find (a) the reading a 9:20 A.M. and (b) when the reading, to the nearest degree, will show the correc (70°F) indoor temperature. ANS. (a) 58°F;(b) 9:46 A.M

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Chapter20: Ratio And Propor Tion
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At 9 A.M., a thermometer reading 70°F is taken outdoors where the temperature is
15°F. At 9:05 A.M., the thermometer reading is 45°F. At 9:10 A.M., the thermometer is
taken back indoors where the temperature is fixed at 70°F. Find (a) the reading at
9:20 A.M. and (b) when the reading, to the nearest degree, will show the correct
(70°F) indoor temperature.
ANS. (a) 58°F; (b) 9:46 A.M
Transcribed Image Text:At 9 A.M., a thermometer reading 70°F is taken outdoors where the temperature is 15°F. At 9:05 A.M., the thermometer reading is 45°F. At 9:10 A.M., the thermometer is taken back indoors where the temperature is fixed at 70°F. Find (a) the reading at 9:20 A.M. and (b) when the reading, to the nearest degree, will show the correct (70°F) indoor temperature. ANS. (a) 58°F; (b) 9:46 A.M
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