Question

valor de a/4=b/5 e a+b=18,o valor de 2a e?

Answer 1

Valor de a/4=b/5 e a+b=18,o valor de 2a :

"5a= 4b"

'a = 18-b"

5.a= 4b

5.(18-b)= 4b

'90-5b=4b 4b'

'90= 4b+5b'

'90 = 9b'

'b = 10'

a= 18-b

a= 18-10'

"a = 8"

2a= 2.8 = "16"

Resp.: 16