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?16205057
Accepted Solution
A:
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]