Question

solve it fast and give me complete solution of the question ​

Answer 1

Answer:

21 rows.

Step-by-step explanation:

Find the pattern.

Pattern= minus 5.

So 120÷5=24.

But, remember that in the last row there are 15 not 0.

So, 5 goes into 15, 3 times.

Subtract 3 form 24.

21 rows.

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Answer 2

ATQ,

• There are 125 perk of chocolate in 1st row, 120 in second, 115 in third and so on.
• Also, in the last row their are 15 boxes.

It is forming a A.P ryt? so, let us write it in that way only;

• 125,120,115...15

So,

• a = 125
• d= a2 - a1 = 120 - 125 = -5
• aₙ = 15

We need to find no. of rows, that is equal to n;

Now,

• aₙ = a + (n - 1)d
• 15 = 125 + (n - 1) × -5
• 15 = 125 -5n + 5
• 15 = 130 - 5n
• 15 - 130 = -5n
• -115/-5 = n
• 23 = n

Therefore, the no. of rows of chocolate = 23. $\;$