The temperature of a certain substance in the refrigerator was-2°C. When the substance was removed from the refrigerator, the temperature rose by 7℃. What was the new temperature of the substance?
A.
+9 ℃
B.
+5 ℃
C.
-5 ℃
D.
-9 ℃
2.
Fill in blank with the correct answer
At 7:00 p.m., the temperature at the peak of Mount Kenya was 5°C. By midnight, the temperature dropped by 18℃. The new temperature at the peak of the mountain was ___ ℃.
A.
23℃
B.
13℃
C.
-13℃
D.
13 ℃
3.
A diver was 150 m below the sea level. He swam 43 m upwards towards the surface to point A. At point A, he fired a marble upwards using a toy gun. The marble moved 128 m upwards to point B. Determine the integer representing the distance of point B above the sea level.
A.
-21m
B.
-221m
C.
+21m
D.
+221m
4.
A tank is filled with water by two taps, A and B. When opened alone, tap A fills the tank in 30 minutes, and tap B takes 15 minutes. If the two taps are opened together for 7 minutes, what fraction of the tank will they fill?
A.
1/15
B.
1/30
C.
1/10
D.
7/10
5.
Wanyama gave 1/4 of his land to his brother and 1/3 of the land to his daughter. He donated the remaining piece of land to a school. What fraction of the land did he donate to the school?
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