Restaurants often slip takeout menus under Nina's apartment door. So far, Nina has collected 20 menus, including 4 for Indian food. Considering this data, how many of the next 15 menus
slipped under Nina's door should you expect to be from Indian restaurants?
menus
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3 indian menus

Step-by-step explanation:

If we assume that the proportions would remain the same then we can use the values provided to calculate the number of indian menus. We can use the Rule of Three in this scenario, since it is a ratio problem and we are given 3 values and a variable. We simply multiply the diagonal values and divide by the remaining value to get the variable.

20 menus   <>   4 indian menus

15  menus   <>   x indian menus

(15 * 4) / 20 = x

60 / 20 = x

3 = x

n=9

step-by-step explanation:

7 times a number = 7n

decreased by 13 = 7n-13

same as is =

5 times the number = 5n

increased by 5 = 5n+5

7n-13 = 5n+5

2n=18

n=9