A CITY WITH AN AREA OF 100 SQUARE KILOMETRES RECEIVED 1 CM OF RAIN...

4. - TRƯỜNG THCS HOÀNG XUÂN HÃN
TRƯỜNG THCS HOÀNG XUÂN HÃN

4. A city with an area of 100 square kilometres received 1 cm of rain on a certain day. If the average rain-

drop has a volume of 10 mm

3

, the number of raindrops that fell on the city that day was:

(A) 10

8

(B) 10

9

(C) 10

12

(D) 10

13

(E) 10

14