1. a) 4364+2080=6444
6444 - 1587=4857
b) 7352 - 3784=3568
3568 + 1587=5155
2. a) 2756 +2319 =5075
3245 +5905=9150
b) 8109 - 3874 =4235
9786 - 3421 =6365
3. a+b+c=4974
a= b - 184
b + c =2715
a + 2715=4974
a=4974 - 2715
a= 2259
b - 184 = 2259
b= 2359 + 184
b= 2443
2443 + c = 2715
c = 2715 - 2443
c =272