Question

318×17-b=2878
C-257×34=398
86×24-a=1379
B×37×62=3200

Answer 1

1. 318×17-b=2878 318×17= 5406 5406-2878=2528 B

2. C-257×34=398 257×34= 8738 8738-398=8340 C

3. 86×24-a=1379 86×24=2064-1379= 685 B

Answer 2

318×17-b=28785
5406-b=2978
b=5406-2978
b=2528

c-257×35=398
c-8995=398
c=8995+398
c=9393

86×24-a=1379
2064-a=1379
a=2064-1379
a=685