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

Miss sim would travel 28 in 40 days