Question

add 6 , 1 upon 4 + 6 one upon 4 6 one upon 4-----80 times

Answer 1

$6 \times \frac{1}{4 } = 6.25 \\ as \: it \: is \: to \: add \: 80 \: times \\ therefore \: 6.25 \times 80 = 500$