Question

Din produsul numerolor 80 si 5 am scazut doimea unui numar am adunat la diferenta obtinuta produsul numerolor 82 si 5 si am obtinut catul numerolor 3880 si 5 afla numaru

Answer 1

(80×5-2×a)+82×5=3880÷5
(400-2×a )+410=776
400-2×a=776-410
400-2×a=366
2×a=400-366
2×a=36
a=36÷2
a=18

Answer 2

(80×5)-x/2+(82×5)=776;400-x/2+410=776|×2;800-x+820=1552;x=1620-1552;x=68