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Lemonade and Iced Tea

GMAT-NOETGQ

Johnny has a bottle with $6$ cups of lemonade and $7$ cups of iced tea. He adds iced tea until the bottle contains $30\%$ lemonade.

How much iced tea did he add?

A

$7$ cups

B

$6$ cups

C

$5$ cups

D

$4$ cups

E

$3$ cups