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crimeas [40]
4 years ago
10

A, B, C are circular regions as shown below. There are 7 items in C and there are 20 items in A but 10 of those items are not in

B. How many items are in B that are not in C

Mathematics
1 answer:
Elenna [48]4 years ago
3 0

Answer:

3 items are in B that are not in C

Step-by-step explanation:

a: only in a, not count those in b or c

b: only in b, not count those in a or c

c: only in c, not count those in a or b

A = a + b + c = 20

c = 7

a + b = 20 - 7 = 13

10 not in b, of course not in c ∴ a = 10

b = 13 -10 = 3

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