Well, darling, there are two 3s in 78. Simple math, really. But hey, if you need help with anything else, I'm here to sprinkle some sass on it.
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L + S = 72 so L = 72 - S; 4L - 3S = 78 ie 4(72 - S) - 3S = 78 ie 288 - 4S - 3S = 78 ie 7S = 210 so S = 30 and L = 42. And there you have it!
28 3s
9
3000/3 = 1000
There are: 21/3 = 7