In a year, there are 4 months that have 30 days. what is the ratio of the months with 30 days to the months with other than 30 days?

answer

d. 10

explanation

the distance from point y to wx is the height of the triangle.

using pythagoras theorem,

group similar terms to get,

this implies that,

take positive square root of both sides to get,

this implies that,