John made 60 ml of dragonfuit smoothie that is 30% dragonfruit. He wants to make a smoothie with 40% dragonfruit. How much more dragonfruit does he need?

Please explain as well. Thanks.

Guest May 16, 2017

#1**+1 **

He needs to add some quantity, x, of 100% dragonfruit to the 60 ml of 30% mixture to produce a quantity of (60 + x) ml at 40%

Mathematically we have

60* .30 + x * 1.00 = (60 + x) * .40 simplify

18 + x = 24 + .40x subtract 18 and .40x from both sides

.60x = 6 divide both sides by .60

x = 10 ml of 100% dragonfruit need to be added

CPhill
May 16, 2017