NRICH: Adding and Multiplying
Amy misread a question and got an incorrect answer. What should the answer have be?
Amy was asked to multiply a number by 8 and then add 5.
Instead, she added 8 to the number, then multiplied the result by 5.
This gave her 2015.
What would the answer have been if Amy had followed the instructions correctly?
This problem is adapted from the World Mathematics Championships
Age 11 to 14
What are you looking for?
Organization
Website URL
Type of Resource
Assigned Categories
Resource k12
Amy misread a question and got an incorrect answer. What should the answer have be?
Amy was asked to multiply a number by 8 and then add 5.
Instead, she added 8 to the number, then multiplied the result by 5.
This gave her 2015.
What would the answer have been if Amy had followed the instructions correctly?
This problem is adapted from the World Mathematics Championships
Age 11 to 14