Ramkali saved Rs 5 in the first week of a year and then increased her weekly saving by Rs 1.75. If in the nth week, fher weekly savings become Rs 20.75, find n.

Mathematics

Class 10

1422

Alexandria

Krishav

Answer / Solution

Answer / Solution

**Solution: **

Given that, Ramkali saved Rs.5 in the first week and then started increasing her savings each week by Rs.1.75.

Hence, First term, a = 5 and the common difference is d = 1.75

Also given, a_{n} = 20.75 then Find the value of n, i.e. n = ?

As we know, by the nth term formula, a_{n} = a + (n − 1) d, therefore,

20.75 = 5 + (n – 1) × 1.75

15.75 = (n – 1) × 1.75

(n – 1) = 15.75/1.75 = 1575/175

= 63/7 = 9

n – 1 = 9

n = 10

**Hence, the value if n is 10.**

- All the NCERT Solutions have been prepared by academic experts having 10+ years of teaching experience.
- They have prepared all the solutions in simple and easy language so that each and every student can understand the concepts easily.
- All the solutions have been explained step to step-wise in details with better explanations.
- Students can also use these question and answers for your assignments and in homework help.
- All the solutions have been explained in detail and the answers have been compiled in a step-wise manner.
- All the questions and answers are commonly prepared according to the Latest Syllabus of Board Education and Guidelines.
- Students can know about the various types of questions asked in the exams with the help of these solutions.