Question

The product of the number on two consecutive volume of research is 420, find volume number

Answer 1

v= volume number
v; v+1

v(v+1) = 420
v^2 + v - 420 = 0
(v-20)(v+21)

v1 = 20 ; v2 = - 21 (void)


20; 21 are the two volume numbers

Answer 2

20 or 21 anyone will work