Question

after charging for 1/3 pf an hour, a phone is at 2/5 of it full power. how long will it take the phone to charge completely?

Answer 1

First convert the fraction into sixths, so after charging for 2/6 of an hour the phone is at 2/5 charge, also meaning that 1/6 of an hour will get the phone to 1/5 charge. This means that after charging the phone for 5/6 of an hour the phone will be fully charged.