Atoothbrush and toothpaste cost one dollar and ten cents total. the toothbrush costs a dollar more than the toothpaste. how much does the toothpaste cost?

Cost of the toothbrush and the toothpaste together = $1.10
Let us assume the cost of the toothpaste = x
Then
The cost of the toothbrush is = (x + 1) dollar
Then we can write the equation as
x + x+ 1 = 1.10
2x + 1 = 1.10
2x = 1.10 - 1
2x = 0.10
x = 0.10/2
  = .05 dollars
So the cost of the toothpaste is 0.05 dollars.I hope the procedure is clear to you.