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How many terms are there in 20, 25, 30 . . . . . . 140?

A. 22 B. 25 C. 23 D. 24 Answer: Option B
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Solution(By Apex Team)

$\begin{aligned}&\text{Number of terms,}\\ &=\frac{\left(\text{ last term }-1^{\text{st}}\text{ term }\right)}{\text{Common difference}}\text{ }+1\\ &=\frac{140-20}{5}+1\\ &=\frac{120}{5}+1\\ &=24+1\\ &=25\end{aligned}$

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