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!