Question

afla numarul necunoscut : 3600:100-a:4=29, 4200:10+a=1987 , a-3600:100=439 , 4800:1000+a:5=57, a+11700:100*3=976

Answer 1

3600:100-a:4=29 36-a:4=29 a:4=36-29=7 a=7x4 a=28 4200:10+a=1987 420+a=1987 1987-420 1567 a-3600:100=430 a-36=430 430+36 466