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Schach [20]
3 years ago
11

A bag contains yellow marbles and blue marbles, 23 in total. The number of yellow marbles is 7 less than 2 times the number of b

lue marbles. How many yellow marbles are there?
Mathematics
1 answer:
erica [24]3 years ago
3 0

Answer:

8

Step-by-step explanation:

yellow marbles=2b-7

blue marbles=2b

2b+2b-7=23

4b=23+7

4b=30

b=30/4

b=7.5

yellow marbles=2b- 7

2 x 7.5 -7

15 - 7

=8

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