Question

x/9=1000-910 100/x=2430-2030 100:x=2430-2420

Answer 1

х/9=1000-910
х/9=90
х=90*9
х=810

100/х=2430-2030
100/х=100
х=100:100
х=1

100:х=2430-2420
100:х=10
х=100:10
х=10