answer to 1+4=5, 2+5=12, 3+6=21, 8+11=?
the answer is 40you go up what ever it equals so like1+4=5 but 2+5=12 that does not make sense but wait1+4=5 5+5+2=12 12+6+3=21 and 21+8+11=40
19+21 = 40 is the answer.You take whatever it equals and add it to the next equation.