Calculate the Day: Solving for When Daniel's Savings Reach Exactly $29

Question

Daniel bought a piggy bank. On the first day, he put in 15andeverydayheadds15 and every day he adds 2. Is it possible for Daniel to save exactly $ 29? If so, when?

Video Solution

Solution Steps

00:00 Is it possible to save 29 shekels? If so, on which day?
00:04 We want to find the Nth place equal to number 29
00:11 We'll use the arithmetic sequence formula to find place N
00:15 We'll substitute appropriate values according to the given data to find N
00:32 We want to isolate N
00:48 Let's reduce as much as possible
00:54 Let's isolate the unknown N
01:01 And this is the solution to the question

Step-by-Step Solution

To determine if Daniel can save exactly 29,wemodelhissavingsasanarithmeticsequence.</p><ul><li><strong>Step1:Identifythegiveninformation</strong></li></ul><p>Initially,Danielputsin29, we model his savings as an arithmetic sequence.</p> <ul> <li><strong>Step 1: Identify the given information</strong></li> </ul> <p>Initially, Daniel puts in 15, and he adds 2daily.Wearelookingforthedaywhenthetotalsavingsequals2 daily. We are looking for the day when the total savings equals 29.

  • Step 2: Set up the sequence formula

The nn-th term of an arithmetic sequence is given by:

an=a1+(n1)d a_n = a_1 + (n-1) \cdot d

Where:

  • a1=15a_1 = 15, the amount on the first day
  • d=2d = 2, the daily addition
  • an=29a_n = 29, the amount we want to achieve
  • Step 3: Solve for nn

Set up the equation:

29=15+(n1)2 29 = 15 + (n-1) \cdot 2

Simplifying:

29=15+2n2 29 = 15 + 2n - 2

29=13+2n 29 = 13 + 2n

16=2n 16 = 2n

n=8 n = 8

Therefore, Daniel will have exactly 29ontheeighthday.</p><p><strong>Conclusion:</strong></p><p>Yes,itispossibleforDanieltosaveexactly29 on the eighth day.</p> <p><strong>Conclusion:</strong></p> <p>Yes, it is possible for Daniel to save exactly 29, and it will occur on the eighth day.

Answer

Yes, on the eighth day.