The tempture

The tempture increased 13°F between 6AM and 3PM. The tempture at 3PM was 70°F. What was the tempture at 6AM?

Correct answer:

t1 =  57 °F

Step-by-step explanation:

Δ=13 °F t2=70 °F  t2=t1+Δ  t1=t2Δ=7013=57°F

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