In each of these pairs of lengths, the first is the length on a scale drawing and the second is the corresponding length in real life.
Calculate the scale in each case.
a. 20 cm.......................... 1200 cm
b. 25 cm.........................    100 m
c. 5 cm............................      75 m
d. 6 cm............................    0.3 km
e. 12 mm........................   600 m