Question

2. Form the pair of linear equations in the following problems, and find their solutions (if they exist) by the elimination method:

(i) If we add 1 to the numerator and subtract 1 from the denominator, a fraction reduces to 1. It becomes if we only add 1 to the denominator. What is the fraction?
(ii) Five years ago, Nuri was thrice as old as Sonu. Ten years later, Nuri will be twice as old as Sonu. How old are Nuri and Sonu?
(iii) The sum of the digits of a two-digit number is 9. Also, nine times this number is twice the number obtained by reversing the order of the digits. Find the number.
(iv) Meena went to a bank to withdraw Rs.2000. She asked the cashier to give her Rs.50 and Rs.100 notes only. Meena got 25 notes in all. Find how many notes of Rs.50 and Rs.100 she received.
(v) A lending library has a fixed charge for the first three days and an additional charge for each day thereafter. Saritha paid Rs.27 for a book kept for seven days, while Susy paid Rs.21 for the book she kept for five days. Find the fixed charge and the charge for each extra day.

Answer 1

Answer:

hi dipen 3 the group consisting of a socialist party and the group and I am a socialist republic of the group consisting of a socialist republic of the group consisting of the group consisting of

Step-by-step explanation:

hi dipenam the Russian revolution in the group and I am a socialist party in New York in New Zealand Singapore

Answer 2

Given  :   Five years ago, Nuri was thrice as old as Sonu. Ten years later, Nuri will be twice as old as Sonu

To Find :  . How old are Nuri and Sonu?

Solution:

Nuri   = N

Sonu = S

Five years ago, Nuri was thrice as old as Sonu.

=> N - 5  = 3 (S - 5)

=> N - 5 = 3S - 15

=> N  = 3S - 10

Ten years later, Nuri will be twice as old as Sonu

N + 10  = 2(S + 10)

=>  N + 10 = 2S + 20

=> N = 2S + 10

3S - 10 = 2S + 10

=> S = 20

=>  N = 50

Nuri is 50 Years old

Sonu is 20 Year old

The sum of the digits of a two-digit number is 9. Also, nine times this number is twice the number obtained by reversing the order of the digits. Find the number.

A + B = 9

9 (10A + B) = 2 (10B + A)

=> 90A + 9B = 20B + 2A

=>  88A = 11B

=> B = 8A

=> A + 8A = 9

=> A = 1

=> B = 8

18 is the number  

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