Question

Calculează a + 2b + c, ştiind că:
165 – 9a = 8b = 30c = 120​

Answer 1

Răspuns:

39

$165-9a=120=> 165-120=90=>45 = 9a => a = 5$

$8b = 120=> b = 120 : 8 => b = 15$

$30c = 120 => c = 120 : 30 => c = 4$

$a+2b+c = 5+2*15+4=>\\\\a+2b+c = 5 + 30 + 4\\\\a+2b+c = 39$