Answer :
62 (original temperature) + 6.5 (afternoon temperature increase) - 8.7 (temperature decrease)
62 + 6.5 - 8.7
68.5 - 8.7
59.8
the evening temperature is 59.8°F
62 + 6.5 - 8.7
68.5 - 8.7
59.8
the evening temperature is 59.8°F