Question

Jane measures her plant every week with her hand. Every week, it grows by $2$ handspan.
On week $1,$ it measured the following:



How much will be its length after $3$ more weeks?

• A. $12$ handspan
• B. $10$ handspan
• C. $8$ handspan
• D. $14$ handspan

Answer 1

The correct option is B $10$ handspan

Say:
Jane measures her plant every week with her hand. Every week, it grows by $2$ handspan.

Steps:
In week $1,$ it measured $4$ handspan.
In week $2,$ it will grow by two handspan. So it will be $=4+2=6$ handspan.
In week $3,$ it will grow by two handspan. So it will be $=6+2=8$ handspan.
In week $4,$ it will grow by two handspan. So it will be $=8+2=10$ handspan.
Hence, after 3 more weeks, it’ll be $10$ handspan long.
Thus, Option B is the correct one.



Probing Q: Why did we calculate for 4 weeks when the question asked was for $3$ weeks? Let us correct it and make the answer as 8 handspan, i.e., option A. Shall we?
A: No! The question says: $3$ more weeks. This makes it week $1+3$ more weeks, i.e., $4$ weeks.