Question

C 15x + 24 (40-x) =690​

Answer 1

Ответ:

30

Объяснение:

$15x + 24(40 - x) = 690 \\ 15x + 960 - 24x = 690 \\ 15x - 24x = 690 - 960 \\ - 9x= - 270 \\ x = 270 \div 9 \\ x = 30$