Answer: 45 sandwiches
Explanation:
If Wendy makes 3 sandwiches in 5 minutes, we have to find how many sandwiches she makes in 75 minutes. We can divide 75 by 5 since they both are the same variable given. When doing this, we get 15 which means that 15 times the ratio of 5 : 3 equals 75 : x. Now that we know what to multiply by, we have to find out (x) in the ratio above so we multiply the 3 which is on the same side of both ratios, by 15. 15 x 3 = 45
In more simple terms, you have to divide 75 by 5 to find the factor that changes the ratio and you get 15. Then you have to multiply 3 by 15 to get the number of sandwiches made when 75 minutes are spent and you get 45.