Question

qual o valor de x na figura ?

Answer 1

( 9 + 5)/21 = 9/X
14/21 = 9/X
14X = 189
X = 189/14 =13.5 ***

21 - 13.5 = 7.5 ***

prova
9/5 = 13.5/7.5
9 * 7.5 = 5 * 13.5
67.5 = 67.5 confere