rainbow robots inc was demonstrating window washing the big red robot washed half of the windows in the building the green robot washed two thirds of the windows in the building the blue robot washed one half of the windows left finally the yellow robot washed the last 10 windows how many windows did they wash together

the answer is c. 23/3

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)