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Vladimir [108]
3 years ago
6

How much does the book cost?

Mathematics
1 answer:
lina2011 [118]3 years ago
6 0
Okay so the two equations are (b-book d-dvd)
d-4=b
and 3d+b=28

so to solve this if we know that a dvd costs £4 more than a book and we have 3 of them then if we take 3 lots of 4 away from the 28 then we will have an amount equal to 4 books
so 28-12=14
14/4= £3.50
if 1 book is £3.50 then a dvd is £7.50 as it is £4 more
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381 different types of pizza (assuming you can choose from 1 to 7 ingredients)

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But then you have 3 different options to order cheese, so you can combine each one of these 127 ways of selecting ingredients with a single, double or triple cheese in the crust.

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