Question

the sum of two consecutive whole number is 4. Give the least value of the smaller number

Answer 1

n + n+1 = 4

2n = 3
n = 1/5 , but n is to be a whole number, so no solution to your problem

e.g.
1+2 = 3
2+3 = 5
nothing equals 4

(the sum of two consecutive whole numbers is always odd, think about it)