Math, asked by mahikesarwani100, 10 days ago

question number 17 ,18 ,19 and 20 do in copy please with proper solution​

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Answers

Answered by yashnaidu283
0

Step-by-step explanation:

17)

The sides are=a,2a+3,3a-3

Perimeter=60cm

a+2a+3+3a-3=60

6a=60

a=10cm

2a+3=2(10)+3

23cm

3a-3=3(10)-3

27 cm

Smallest side is 10cm=a

18)

Given

Number of prizes=100

Total amount=20000 rupees

Each person's prize amount = 100 or 500

Let the number of prizes for 100 rupees be x

Number of prizes for 500 rupees=100-x

100x+500(100-x)=20000

100x+50000-500x=20000

50000-400x=20000

50000-20000=400x

30000=400x

30000/400=x

x=75

100-x=100-75=25

Number of prize for 100 rupees=75 and for 500 rupees=200

19)

Given,

Difference of ages between father and son=24 years

Let sons age be x

Father's age=x+24

5 years ago son's age was 1/3rd of father's age

1(x-5)=(x-24)-5

3

x-5=(x-24-5)3

x-5=(x-29)3

x-5=3x-87

x-3x=-87+5

-2x=-82

x=41

Father's age=41+21

=62 years

Son's age=x=41 years

20)

Ramesh is thrice as old as Naresh

Let Naresh's age=x

Ramesh's age =3x

After 5 years,He will be twice as old as Naresh

3x+5=2(x+5)

3x+5=2x+10

3x-2x=10-5

x=5 years

3x=3(5)

15 years

Rajesh:s age=15 years and Naresh's age=5 years.

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