The number of half page advertisements that Michael purchased is 4 while the full page advertisements is 11.
Let the number of half page ads be represented by h
Let the number of full page ads be represented by f.
Total number of advertisements = 15
h + f = 15 ....... (i)
h = 15 - f
Therefore, the system of equations to represent the situation will be:
60h + 100f = 1340 ........ (ii)
Put the value of h into equation (ii)
60(15 - f) + 100f = 1340
900 - 60f + 100f = 1340
Collect like terms
100f-60f = 1340-900
40f = 440
f = 11
The number of full-page advertisements that Michael purchased is 11.
Since h + f = 15
h + 11 = 15
h = 15 - 11
h = 4
The number of half page advertisements that Michael purchased is 5.
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