A bat and a ball cost $1.10 in total. The bat cost a dollar more than the ball. How much does the ball cost?

Bab Aritmatika Sosial
Matematika SMP kelas VII

bat = p
ball = q

p = q + 1

p + q = 1.10
q + 1 + q = 1.10
2q = 1.1 - 1
q = 0.1/2
q = $ 0.05

ball = $ 0,05