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Hi, you may want to consider this instead! :)
Date Posted:
6 years ago
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Constant total concept. After solving for 1 unit remember to go back to qn to see what u are solving for. Ask your teacher for help if u still have qns.
Date Posted:
6 years ago
20 is the difference. Meaning 1 unit =20. At first box A is 5 units so u need to multiply 20 x 5 =100.