If 40 is 30% of number, find that number, I NEED THE ANSWER ASAP

The number is

Step-by-step explanation:

If something is 30% of a whole it means that if whe divide the whole into 100 and take 30, you will get this number. In order to get the whole we need to divide it my the 40 by and so we get.....

40 ÷ =

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)

597

step-by-step explanation: