Ramkali saved rupees 5 in first …
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Sia ? 6 years, 2 months ago
Here, a = Rs 5
d = Rs 1.75
an = Rs 20.75
We know that
an = a + (n - 1)d
{tex} \Rightarrow {/tex} 20.75 = 5 + (n - 1)d
{tex} \Rightarrow {/tex} (n - 1) (1.75) = 20.75 - 5
{tex} \Rightarrow {/tex} (n - 1) (1.75) = 15.75
{tex} \Rightarrow n - 1 = \frac{{15.75}}{{1.75}}{/tex}
{tex} \Rightarrow {/tex} n - 1 = 9
{tex} \Rightarrow {/tex} n = 10
Hence, the required value of n is 10.
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