200
70 + 80 + 70 + 30+ 80 + 80+ 80 = 490
the sum for 20 + 40 + 70 + 80 = 210
Take your pick; 10 and 20, 10 and 30, 10 and 40, 10 and 50, 10 and 60, 10 and 70, 10 and 80, 10 and 90, 20 and 30, 20 and 50, 20 and 70, 20 and 90, 30 and 40, 30 and 50, 30 and 70, 30 and 80, 40 and 50, 40 and 70, 40 and 90, 50 and 60, 50 and 70, 50 and 80 50 and 90, 60 and 70, 70 and 80, 70 and 90, 80 and 90.
100-20=80 but 80-70=10 so that leave use with 10 dallors
The result of the equation - 130 plus 80 plus 60 plus 70, is found as follows;130 + 80 + 60 + 70= ( 130 + 80 ) + 60 + 70= 210 + ( 60 + 70 )= 210 + 130= 340Answer = 340
The result of the equation - 70 plus 90 plus 60 plus 80, is found as follows; 70 + 90 + 60 + 80 = ( 70 + 90 ) + 60 + 80 = 160 + ( 60 + 80 ) = 160 + 140 = 300 Answer = 300
The result of the equation - 130 plus 70 plus 60 plus 80, is found as follows;130 + 70 + 60 + 80= ( 130 + 70 ) + 60 + 80= 200 + ( 60 + 80 )= 200 + 140= 340Answer = 340
The result of the equation - 130 plus 80 plus 30 plus 80, is found as follows;130 + 80 + 30 + 80= ( 130 + 80 ) + 30 + 80= 210 + ( 30 + 80 )= 210 + 110= 320Answer = 320
95 + 80 + 80 + 30 = 285
The result of the equation - 130 plus 80 plus 20 plus 80, is found as follows;130 + 80 + 20 + 80= ( 130 + 80 ) + 20 + 80= 210 + ( 20 + 80 )= 210 + 100= 310Answer = 310
80
80 - 10 = 30 + 40Both sides of the sum now equal 70.