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Although reading it again, I think what it means when it says 2 dozen more, is simply 24 more Titleist than Calloway, which would make it (b +24). That's what I get for trying to doing maths too early on a Sunday morning!!!!! So, in fact we get; 0.60b + 0.94(b+24) + 1.10( 3(b+24) + 1 = 140.50 Then, multiply out the equation and solve. Hope this helps.
We need to use algebra. Let us say the number of Calloway ones, is b. Then, if he buys 2 dozen more Titleist ones, he buys 24 x b of the, or 24b. Now if he buys 3 times as many Nike ones as Titleist ones, he buys 3 x 24b = 72b
I'll give it a go...

I can show you how to this one, if you're still interested. It might be better as a private session, so I can upload pics/screenshots.

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