Find the cost of a set of pens The cost of a set of books is twice the cost of a set of pens. The cost of a set of pens is three times the cost of a set of pencils. Find the cost of a set of pens if N 4 000 is used in buying the three sets of the items. cost of a set of books = 2(cost of set pens) cost of a set pens = 3(cost of set of pencils) Since the three set of items cost N 4 000, the only equation from the problem is 2( cost of set of pens) + 3( cost of set of pencils) = N 4 000. I don't know where to go from here. 
$b = 2pn$ $pn = 3pl$ $3(b + pn + pl) = 4000$ $3(6pl + 3pl + pl) = 4000$ $30pl = 4000$ $pl = \dfrac{400}{3}$ $pn = 400$ 
Please what do the following equations mean? Am going to number them. $b = 2pn$ ______________________________________ 1 $pn = 3pl$ _____________________________________ 2 $3(b + pn + pl) = 4000$ ________________________ 3 $3(6pl + 3pl + pl) = 4000$ _____________________ 4 $30pl = 4000$ $pl = \dfrac{400}{3}$ $pn = 400$ Again what are the following pn, pl and b? 
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pn = sets of pen pl = sets of pencils Romsek was throwing "the book" at you!! 
If a set of pencils costs M1, a set of pens must cost M3 and a set of books must cost M6, so the three sets have a total cost of M10. Hence M10 = ₦4000, and so M3 = ₦1200. Check: set of books: ₦2400 set of pens: ₦1200 set of pencils: ₦400 Total: ₦4000, as required. 
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a = 2b b = 3c a + b + c = 4000 RATIOnalize to your heart's content! 
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The assertion above is very correct. It is just like saying that the ratios of set books to set of pens to set of pencils is 
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