Question

Câu 8: Tìm a biết: 30% x a + a = 65

Answer 1

$\\$ `30% × a + a = 65`

$\\$ `0,3 × a + a × 1 = 65`

$\\$ $(0,3 + 1) × a =65$

$\\$ $a = \dfrac{65}{1,3}$ 

$\\$ $a=50$

$\\$ Vậy `:` $a=50$.

 

Answer 2

\(30\%\times a+a=65\\ \dfrac{3}{10}\times2a=65\\ 2a=65:\dfrac{3}{10}\\ 2a=\dfrac{650}{3}\\ a=\dfrac{650}{3}:2\\ a=\dfrac{325}{3}\)

Answer 3

30%×a+a=65

0,3×a+a×1=65

(0,3+1)×a=65

a=65/1,3

a=50

Vậy:a=50