Eight increased by the product of a number and 4 is at most 20

3

Step-by-step explanation:

eight increased by the product of a number and 4 is at most 20

these implies

8 + a x4 = 20

a is the number whose product with 4 is increased by eight to give at most 20

8 + a x4 = 20

8 + 4a = 20

subtract 8 from both sides

4a = 20 - 8

4a = 12

divide both sides by 4

a = 12/4 = 3

the number is 3