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Snezhnost [94]
3 years ago
14

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? Please help its due really soon!
Mathematics
1 answer:
steposvetlana [31]3 years ago
3 0

Answer:

b=10, a=13

Step-by-step explanation:

let s number of yellow = a

number of blue = b

we have

a+b =23

2b - a = 7

->a+b +2b -a = 23+7

-> 3b = 30

->b = 10

->a = 13

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