85 is 20% of what number? enter your answer in the box. [ ] 81 is 18% of what number? enter your answer in the box. [ ] what number is 40% of 135? enter your answer in the box. [ ] olivia wants to walk 8000 steps today. she walked 45% of this total before lunch. how many steps did olivia walk before lunch? enter your answer in the box. [ ] mary delivers 32 newspapers to her customers in 25 minutes. these deliveries represent 64% of her customers. how many customers does mary have? 16 20 50 57

85 is 20% of what number?
85 = 20% × n
85 = .20n
85/.20 = .20n/.20
[n = 425]

81 is 18% of what number?
81 = 18% × n
81 = .18n
81/.18 = 18n/.18
[n = 450]

What number is 40% of 135?
n = 40% × 135
n = .40×135 = 54
[54]

Olivia wants to walk 8000 steps today. She walked 45% of this total before lunch.
How many steps did Olivia walk before lunch?
s = 45% × 8000
s = .45×8000 = 3600
[3600]

Mary delivers 32 newspapers to her customers in 25 minutes. These deliveries represent 64% of her customers.
How many customers does Mary have?
32 = 64% × n
32 = .64n
32/.64 = .64n/.64
n = 50
[50]