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23-01-2018
Mathematics

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A bat and a ball cost one dollar and ten cents in total. The bat costs a dollar more than the ball. How much does the ball cost?

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cdw2014 cdw2014

23-01-2018

x = bat
y = ball

x + y = 1.10

x = y + 1.00

Plug y + 1 in for x

(y+1) + y = 1.1

2y + 1 = 1.1

2y = 0.1

y = 0.05

If the ball is 5 cents, then the bat is 1.1-0.05= $1.05

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