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Math Help - Not sure I understand...

  1. #1
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    Not sure I understand...

    Hi,

    Could someone please explain this to me....

    "Write a formula to calculate the total cost, T, of B Maths books each costing P and B Physics books each costing twice as much as each Maths book."

    The answer is T = 3BP

    What i'm not sure about is where the 3 comes into play?

    Is it

    B Maths books EACH costing... = 1

    B Physics books costing TWICE as much as EACH maths book = 2

    so thats where the 3 comes from or am I completely on the wrong lines!!!!

    My initial thought would have been T = 2BP but thats wrong...

    Thanks in advance, I'm struggling with maths at the moment!
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  2. #2
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by c19h28o2 View Post
    Hi,

    Could someone please explain this to me....

    "Write a formula to calculate the total cost, T, of B Maths books each costing P and B Physics books each costing twice as much as each Maths book."

    The answer is T = 3BP

    What i'm not sure about is where the 3 comes into play?

    Is it

    B Maths books EACH costing... = 1

    B Physics books costing TWICE as much as EACH maths book = 2

    so thats where the 3 comes from or am I completely on the wrong lines!!!!

    My initial thought would have been T = 2BP but thats wrong...

    Thanks in advance, I'm struggling with maths at the moment!
    As you say. The Math book costs x and the Physics book costs 2x. So if you buy B Math books and B Physics books you are going to pay
    Bx + B(2x) = 3Bx

    -Dan
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  3. #3
    Newbie
    Joined
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    Thanks Dan,

    Suppose its just a way of thinking!
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