Question

2. A positive number is 5 times another number. If 21 is added to both the numbers,
then one of the new numbers becomes twice the other new number. What are the
numbers?
3. Sum of the digits of a two-digit number is 9. When we interchange the digits, it is
found that the resulting new number is greater than the original number by 27. What
is the two-digit number?
4. One of the two digits of a two digit number is three times the other digit. If you
interchange the digits of this two-digit number and add the resulting number to the
original number, you get 88. What is the original number?
5. Shobo's mother's present age is six times Shobo's present age. Shobo's age five
years from now will be one third of his mother's present age. What are their
present ages?
6. There is a narrow rectangular plot, reserved for a school, in Mahuli village. The
length and breadth of the plot are in the ratio 11:4. At the rate Rs 100 per metre it will
cost the village panchayat Rs 75000 to fence the plot. What are the dimensions of
the plot?
7. Hasan buys two kinds of cloth materials for school uniforms, shirt material that
costs him Rs 50 per metre and trouser material that costs him Rs 90 per metre.​

Answer 1

Answer:

Step-by-step explanation:

2. let the number be x

the other number is y

x=5y...(1)

x+21=2(y+21)...(2)

from (1)

5y+21=2y+42

3y=21

y=7

x=35

4. x=3y

x+10y+y+10x=88

x+y=8

4y=8

y=2

x=6

answer:62

5.mothers age=x

x=6*shobos age=6y

y+5=1/3(x)

given x=6y

so

y+5=2y

y=5

x=30

6.

let length=11x

breadth=4x

perimeter=2(15x)=30x

1m--------->100/-

30xm----->75000/-

now

3000x=75000

x=75/3

=25

now length=275

breadth=100

7. question is not complete

3. x+y=9

y+10x=x+10y+27

x-y=3

x=6

y=3