Question

20. Subtract the sum of 6b +e+a and - 3a +2c + 3b from the sem of 5a - 8b+ 2e
and 3c - 4b - 2a.
21. Simplify (2x. 3) + 38° ( 4x-x')-7x*
22. Find the product of ( 2x - 5y) (2x + 3y) and value for x = 2 and y - 3
23. Divide - (0) 4x'y + 10x*y - 12 x*y* by (-2 rºy)
(ii) (32x - 24 x + 16x*-12) by (4x) (ii) (a'-lla + 30 ) by (a -5)
(uit) ox? - 27x' + 4x + 30x - 9 by (2x+1) (iv) (y - 6y +9y-2) by (y-2)
24. Solve the linear equations
(in) (x-3)(x-4)+(x+3) - *( 2x - 3) = 0
25. The sum of three consecutive numbers is 39. Find the numbers.
26. Five years ago. Shikha was thrice as old as Honey. 10 years later, Shikha will be twice
as old as Honey. How old are they now?
27. Find two consecutive odd numbers such that two-fifth of the smaller exceeds two - ninths
of the larger by 4.
28. What same number should br added to each of the numbers 2, 7, 10, 25 so that they
may be in proportion.
29. Divide 25 into two parts such that 7 times the first part added to 5 times the second part
makes 139.
30. If each interior angle of a regular polygon is 144", how many sides does this polygon have ?
31. Is it possible to have regular each of whose interior angles measure 1309?

Answer 1

29. Let, the first part is 'x'

then the second part is(25-x)

according to question,

7x+5*(25-x) =139

=> 7x+125-5x=139

=>2x +125=139

=>2x=139-125=14

=>x=14/2=7

25.

let, first number is x

then the second and third number =x-1 and x+1

given that, (x-1)+x+(x+1)=39

=>3x=39

=>x=39/3=13

Answer 2

Answer:

Ques 26.. shikha's age = 50 yrs

honey 's age =20 ye

Ques 29. first part =7. &

second part =18

Ques25....... let three consecutive no. x.

,x+1 & x+2

x+ x+1 x+2 =39

x=36/3

x= 12 , x+1=13. & x+2 = 14

Ques. 22. .... -143

Ques...20. (-6a-15b+c+e)

........

......hope it's helpful