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Numbers which are divisible by 12 as well as 18, must be divisible by 36.
So, numbers between 60 and 320 which are divisible by 36 are: 72, 108, 144, ........., 288
So, total number of terms between 60 and 320 which are divisible by 36 = (288 – 72)/36 + 1 = 6 + 1 = 7
Desired sum = (7/2) × {72 + 288} = 7 × 180 = 1260
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