A bat and ball cost $1.10.

The bat costs one dollar more than the ball.

How much does the ball cost?

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Write the value in dollars not cents
**

The answer is 0.05.

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let x=bat and y=ball, then we have the two equations

x + y = 1.10 (eq. 1)

x = 1 + y (eq. 2)

substitute (eq. 2) in (eq. 1), we have

1 + y + y = 1.10

2y = 0.10

y = 0.10/2 = 0.05 dollars