Question

At sunrise, the temperature outside was -15 C. By midday, it increased by 45 C. By evening, it fell to the existing temperature and by night a decrease of another 25 degree Celsius was observed what was the temperature by night

Answer 1

Answer:

-10 degrees

Step-by-step explanation:

from -15 it rose to 30 degrees, then it fell back down to -15 and then fell by another 25 degrees making the night temperature of -40 degrees.

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Answer 2

Answer:

-15*c

Step-by-step explanation:

since , at the morning the temperature was -15*c and by the midday the temperature increased by 45* c , i.e.( -15) *c + 45* c = 30 *c

therefore, the temperature during the mid day was 30*c .

by the evening the temperature fell to 1/3 rd of the existing temperatue . i.e 1/3 of 30* c

there fore , the temperature in the evening fell to 10 * c

and by the night the temperature decreased by another 25 degrees , thus ,10*- 25 * c = - 15 *c

therefore , the temperature at night was - 15* c