math.camp

Daily Challenge #64

Tuesday, November 3

Today's puzzle

A number is doubled and then 7 is added. The result is 43. What was the original number?

★☆☆3 tries · ranked by speed
Play today's challenge

Free online calculators

Math tools that just work.

Percentages, fractions, finance, geometry, and more. Fast, free, and no sign-up required.

Browse all calculators

Popular calculators

View all 185