6300:90*c=350 (3400-600):x=400 780-y=1440:60

Question

6300:90*c=350
(3400-600):x=400
780-y=1440:60

Answer 1

6300:90*с=350
90*с=6300:350
90*с=18
с=18:90
с=0,2

(3400-600):х=400
2800:х=400
х=2800:400
х=7

780-у=1440:60
780-у=24
у=780-24
у=756