19
90.
The sum of 21 and 21 is 42.
40 + 15% = 40 x (1 + (15/100)) = 40 x 1.15 = 46
2/5+1/8= 16/40+5/40= 21/40
2/5 + 1/8 = 16/40 + 5/40 = 21/40.
this equals 818
36 + 35 + 40 + 40 + 40 + 40 + 40 = 271 271 is the answer
50 + 40 + 40 + 40 + 30 + 30 + 20 + 10 = 260
0.525
7. 8x-40=2x+2 4x-20=1x+1 3x-21=0 3x=21 therefore x=7
40 + 44 = (4 x 10) + (4 x 11) = 4 x 21 = 84
14+14+40+40=108