A student saves money for trip and gives money to his teacher and gives money of 110 and 210 in 5th and 6th week in this way how many weeks he need to accumulate sum of 1680
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This question is in Arithmetic Progression.
Hence, a = 110, d = 100, an = 1680.
We have,
an = a + (n - 1)d
1680 = 110 + (n - 1)100
1680 - 110 = (n - 1)100
1570 = (n-1)100
1570/100 = n - 1
15.7 = n - 1
n = 15.7 + 1
n = 16.7
He need 16.7 or 17 weeks for accumulating ₹1680
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