12 painters were tasked with painting the interior. These painters made up 80% of the painting crew, so how many painters in all worked on this job?

15 painters

Step-by-step explanation:

Let the number of painters be A

To get the number of painters , it’ll be 80% of A = 12

That’s

80% /100% x A = 12

0.8 x A = 12

Divide both sides by 0.8

A = 12/0.8

A = 15

A total of 15 painters worked on the job

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)