1a + 5a + 9a + 15a = 450
30a = 450
a = 450/30
a = 15
1 * 15 = 15
5 * 15 = 75
9 * 15 = 135
15 * 15 = 225
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1a + 5a + 9a + 15a = 450
30a = 450
a = 450/30
a = 15
1 * 15 = 15
5 * 15 = 75
9 * 15 = 135
15 * 15 = 225