Question

the sum of 2 consecutive multiples of 5 is 105

Answer 1

let the first consecutive number be x. second number be x+5. according to question :x+x+5= 105=2x+5=105=2x=105-5
2x=100
x=100/2
x=50
2x+5=55

Answer 2

Let number be x
So here I am using
x+(x+1)
5x+5x+5=105
10x+5=105
10x=100
X=100/10
X=10