Question

a+b=45,b+c=30,3a+5b=?​

Answer 1

Answer:

1.a+b=45

2.b+c=30

3.3a+5b=26

Step-by-step explanation:

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Answer 2

3a + 5b = 195 - 2c

Step-by-step explanation:

Given:

1. a + b = 45
2. b + c = 30

To find: 3a + 5b

Multiplying equation 1 by 3, we get, 3a + 3b = 135 (3)

Now, multiplying equation 2 by 2, we get, 2b + 2c = 60  (4)

Adding the two equations obtained after multiplication, we get

3a + 3b + 2b + 2c = 135 + 60

3a + 5b +2c = 195

3a + 5b = 195 - 2c