Question

5) The price of a book is 5 rupees less than thrice the price of a pen. If book

costs 40 rupees, what does a pen cost?


6) Monthly income of Basheer is 5000 rupees more than one third of Babu’s

income. If Basheer’s income is 25000 rupees, what is the income of

Babu?


7) Hari’s mother is twice as old as Hari. If Hari’s age is x, write the

following using x.

a) What is the age of his mother?

b) How old will be Hari after 2 years?

c) What will be the age of mother after 2 years?

d) How old was Hari before 3 years?

e) What was the age of mother before 3 years?​

Answer 1

Answer:

5

cost of pen is 15 rupees

Answer 2

Answer:

5 ) 15 rupees

Step-by-step explanation:

let the cost of pen be x

since , the book is 5 rupees les than thrice of  pen

therefore,

book = 3x- 5

so if price of book is 40 rupees then

40 = 3x-5

3x= 40+ 5

3x= 45

x= 45/3

x= 15

6) --------------

7) The ratio of Hari's and Harry's present ages is 5:7  

So, let their ages be 5x and 7x

After 4 years their ages will be in ratio 3:4

Therefore,(5x+4)/(7x+4)=3/4

or, 4(5x+4)=3(7x+4)

or, 20x+16=21x+12

or, 16−12=21x−20x

or, 4=1x

or, x=4

Therefore, present age of Hari = 5x=(5×4)=20 years.

Present age of Harry =7x=(7×4)=28 years

The sum of their age is 28+20=48years