Question 1063693
I went to my refrigerator for some lemonade 
 on a hot summer day. All I had was regular lemonade 
 and blue-raspberry lemonade. A blend sounds nice! The
 regular lemonade is 20% lemon juice, and the blue-raspberry is
 50% lemon juice. I want my combination lemonade to be100 mL of
 30% lemon juice because that sounds just right! 

Im comfused and i dont know what to do or what im supposed to find !! 
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Says here:
"I want my combination lemonade to be 100 mL of 30% lemon juice."
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Find how much of each to mix to make that.