1)6300/90*c=350 2)(3400-600)/x=400 3)780-y=1440/60

Question

1)6300/90*c=350
2)(3400-600)/x=400
3)780-y=1440/60

Answer 1

6300:90*с=350
70*с=350
с=350:70
с=5
6300:90*5=70*5=350

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

780-у=1440:60
780-у=24
у=780-24
у=756
780-756=1440:60=24=24