Jennifer made a fruit juice using red and green grapes. Thirty percent of the grapes are green. If she used a total of 60 grapes, how many red grapes should she use?

1 Answer
sente
Jul 31, 2016

#42#

Explanation:

If #30%# if the #60# total grapes are green, then #100%-30%=70%# of the grapes are red. To find the total number of red grapes, then, we must calculate #70%# of #60#. We do so by multiplying #60# by #70%=70/100#.

#"Total red grapes" = 60xx70/100#

#=(60xx70)/100#

#=4200/100#

#=42#

Thus she used #42# red grapes.

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