the total amount cost of 10 pillows and 15 pillow cases is £175. A pillow costs £6.50 more than a pillow case.how much does a pillow case cost?
Let p be cost of a pillow and c be cost of a case. Then
10p + 15c = 175
p = c + 6.5
Replace the p in the first equation using the second equation:
10(c + 6.5) + 15c = 175
25c + 65 = 175
25c = 110
c = 4.4
So a pillow case costs £4.40
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i have no idea