Thor has a seven stones and a hammer. Every time he hits a stone with the hammer it breaks into exactly five smaller stones. He does this several times. Which of the following numbers could be the number of stones he may end with?
(A) 17 (B) 20
(C) 21 (D) 23 (E) 25
Also give me the reason.
Answers
Answered by
3
21 is the answer virat bhai jindabad rcb jitegi parso
Answered by
8
It is a grace that math has questions bout Thor. Lol.
Thor has 7 stones. Total number of stones at each hit can be
7, (6+5), (5+5+5), (4+5+5+5), (3+5+5+5+5) ..........(7×5)
7, 11, 15, 19, 23......35
The resulting is a AP with common difference 4.
We can see 23 is the 5th term of AP and this may the number of stones he end with.
Answer is 23.
If number is not obvious from AP use the formula
a(n) = a + (n-1)d
Substitute for a(n) and find out the option which gives integer value for n. That will be the answer.
Similar questions