Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 10 Answered

Mohini saved Rs5 in first week of a year and then increased his weekly saving by Rs1.75.If in the nth week her weekly savings becomes Rs20.75, find n
Asked by | 25 Jan, 2012, 08:23: AM
Expert Answer
We take a = 5, d = 1.75 and an = 20.75
So we have, a + (n - 1)d = 20.75
Or, 5 + (n - 1)(1.75) = 20.75
Or, (n - 1)(1.75) = 15.75
Or, n - 1 = 9
Or, n = 10
Answered by | 25 Jan, 2012, 10:03: AM

Application Videos

Concept Videos

Multiple Choice Questions Practice Test Subjective Questions Webinar Subjective Questions Pre Board Assessment
Answered Unanswered My Questions My Answers
CBSE 10 - Maths
For an given A.P. a = 3.5, d = 0, then tn = . . . (A) 0 (B) 3.5 (C) 103.5 (D) 104.5
Asked by paresh0311 | 19 Mar, 2023, 12:26: AM
ANSWERED BY EXPERT
CBSE 10 - Maths
find the sum of first 51 term of an AP whose second and third terms are 14 and 18 respectively.
Asked by bkhaiwangkonyak | 07 Mar, 2023, 04:35: PM
ANSWERED BY EXPERT
CBSE 10 - Maths
the sum of fourth and eight terms of an A.P is 54 and their product is 665. find the sum of the first thirty terms of an A.P​
Asked by sakshinde95 | 23 Jan, 2023, 05:50: PM
ANSWERED BY EXPERT
CBSE 10 - Maths
If the sum of first m terms of an A.P. is n and the sum of first n terms is m, then show that the sum of its first (m + n) terms is - (m + n).
Asked by d7016880266 | 20 Jan, 2023, 08:14: PM
ANSWERED BY EXPERT
CBSE 10 - Maths
maths doubt
Asked by dixitayush414 | 04 Jan, 2023, 09:03: PM
ANSWERED BY EXPERT
CBSE 10 - Maths
The students of a school decided to beautify the school on the Annual Day by fixing colourful flags on the straight passage of the school. They have 27 flags to be fixed at intervals of every 2 m. The flags are stored at the position of the middle most flag. Ruchi was given the responsibility of placing the flags. Ruchi kept her books where the flags were stored. She could carry only one flag at a time. How much distance did she cover in completing this job and returning back to collect her books? What is the maximum distance she travelled carrying a flag
Asked by Dilkhushmohad055 | 28 Dec, 2022, 11:02: AM
ANSWERED BY EXPERT
CBSE 10 - Maths
n/2 [2+2n]
Asked by vaishaliboriwarruturushi | 16 Dec, 2022, 07:13: PM
ANSWERED BY EXPERT
CBSE 10 - Maths
find the 31th term of an AP whose 11th term is 38 and 16th term is 73
Asked by jaiprakashprasadr | 19 Jul, 2022, 09:22: PM
ANSWERED BY EXPERT
CBSE 10 - Maths
Arithmetic progession
Asked by samiranroychowdhury942 | 19 Jul, 2022, 08:37: AM
ANSWERED BY EXPERT
CBSE 10 - Maths
how many terms of an AP 1,4,7...must be taken to give a sum of 51?
Asked by jaiprakashprasadr | 17 Jul, 2022, 11:03: PM
ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt