#### Answer

Cherrapunji has the greater average rainfall by 31 inches.

#### Work Step by Step

The rainfall in Mawsynram is 11,870 mm. Since 1 cm = 10 mm, we need to move the decimal place 1 place to the left to convert from units of mm to units of cm.
$11,870~mm = 1187~cm$
We can convert the rainfall in Mawsynram from units of centimeters to units of inches.
$1187~cm = \frac{1187~cm}{1}\times \frac{1~in}{2.54~cm} = 467~in$
The rainfall in Mawsynram is 467 inches.
The rainfall in Cherrapunji is 498 inches.
Cherrapunji has the greater average rainfall by 31 inches.