(х-380)х50=2000 2) (Х + 8) : 70 = 4 3) 640 : (25-Х) = 40

Question

(х-380)х50=2000 2) (Х + 8) : 70 = 4 3) 640 : (25-Х) = 40

Answer 1

(Х-380) х50=2000
Х-380=2000:50
Х-380=40
Х=380+40
Х=420

(Х+8):70=4
Х+8=70 х 4
Х+8=280
Х=280-8
Х=272

640:(25-Х)=40
25-Х=640:40
25-Х=16
Х=25-16
Х=9