Miss sim traveled 42 countries in 60 days at this rate how many countries would you travel in 40 days

Miss sim would travel 28 in 40 days

First, let's make an attempt to find the unit rate:

42/60 = 14/20

14/20 = 7/10

7/10 is close enough, because 40 is a multiple of 10.

Because 40/10 = 4, we'll have to multiply both sides of the fraction by 10:

7*4/10*4

28/40

Miss Sim will travel 28 countries in 40 days