Mrs Tan had some red and blue balloons in a bag. The number of red balloons was twice the number of blue balloons. She started removing balloons from the bag, each time taking out 4 red balloons and 6 blue balloons. After a while, only 120 red balloons were left in the bag. What was the total number of red and blue balloons in the bag at first? [4 marks][Answer given: 270]
<-- 120 -->
R [][][][][][][][][][][][]
B [][][][][][]
8 u --> 120
1 u --> 120/8 = 15
18 u --> 18 x 15 = 270 balloons
There were 270 red and blue balloons at first.
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