Question

A geologist visits 40 volcanoes in Alaska and California. 15% of the volcanoes are in California.

How many volcanoes does the geologist visit in California and how many in Alaska?

Answer 1

Most explained:

40% = 100%

15 = (100% - 15% = 85%) 85% in Alaska

California = 15% of 40 = (0.15 x 40) = 6

Alaska = 85% of 40 = (0.85 x 40) = 34

The simple way (or the way i found it simple):

40 - 15 = 34

15% of 40 = 6

(I found the simple way after i solve the first way)

Bye, i hope this helps.