Unit 7 · Data and Percentage
Six-Digit Bike Lock — Find the Last Digit
Lesson 9 of 9
About this lesson
A six-digit bike lock code. The middle two digits are the product of the first two. The last two are double the middle two. The first digit is 7 and all six digits are different. Only one value of the second digit makes everything work.
Chapters
Question
I have a six-digit code for my bike lock.
The two-digit number formed by the middle two digits was the result of multiplying the first digit by the second digit.
The two-digit number formed by the last two digits of the code was double the number formed by the middle two digits.
The first digit was 7 and all six digits were different.
What is the last digit of the code for my bike lock?
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