So you need to get the fraction to a percentage. Divide 100 by 5 to see how much you need to multiply the 4 by. 100/5 is 20. So you times the 4 by 20 to get 80. 80% have a cellphone so simply minus 80 from 100 to get your answer of those who don't. Therefore the answer is 20.
Yes she would be right as for how i got the answer first i started by using 15 hours as 100% then i times fifteen by 20% which gave me three hours then add three hours to fifteen and it gave me 18. so she worked 120% more than last week hoped that helped
6 seashells left is the answer
-20 + y = 2
y = 22
20 + 3y = 6
y = 14/3