Question

a compass an a ruler together cost $2. the compass costs 90 cents more than the ruler how much does the compass cost

Answer 1

c + r = 4.00
c = r + 90
so
r + r + 90 = 4.00
2 * r = 3.10

r = 1.55
c = 1.55 + 0.90 = 2.45

Answer 2

okay thank you