book Maths Puzzle Numerical Ability

Okay, so I'm not going to get this math without some serious help. I do not understand this. Could someone please help me before I have a total meltdown? This is my issue that I wo

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how could you subtract 48 from 57,62,78,85 I need your help on adding and subtracting fractions with unlike denominators: 3a + 2b /3b - a + 2b /6a=