Question

[linh]

25 nhân x-x =312

(x+20) +(x+30) +(x+50) + x =300

Answer 1

[An Hoà]

25x - x = 312

x ( 25 - 1 ) = 312

24x           = 312

    x           = 13

( x + 20 ) + ( x + 30 ) + ( x + 50 ) + x = 300

( x + x + x + x ) + ( 20 + 30 + 50 )     = 300

4x + 100                                          = 300

4x                                                    = 200

 x                                                     = 50