Question

итоговое число=980
20+х+150
х+130+180
310+х+200
х+500+25

Answer 1

1)20+х+150=980;
х=810;
2)х+130+180=980;
х=670;
3)310+х+200=980;
х=470;
4)х+500+25;
х=455;