+0  
 
+5
1057
2
avatar+297 

1. Find the additive inverse of − 7 11                                                                                                                                                                                                            

 

2. Write the number in standard form 349*106

 

3. Find the number whose square is given 5929

 

4. √0.8 = ?

 

5. convert 6:7 to percentage

 

6. Verify ( 3 4 + − 2 5 )+ − 7 10 = 3 4 +( − 2 5 + − 7 10 )

 

7. Find ((5-1X3-1) -1 ÷6-1 )

 

8. By using the formula evaluate (198)

 

9. Evaluate √(11025)

 

10. Evaluate 3 √3375

 

11. check weather the number is divisible by 9 or not a) 845 b) 45689 c) 981 d) 1026

 

12. Subtract +6p+q+3r+8 from p-2q-5r+6

 

13. Evaluate using identity (49)2

 

14. In what time will Rs 5000 amount to Rs 2230 at 10% per annum, compounded annually?

 

15. On selling a boat for rs 521 a man gains 8 % . For how much should he sell it to gain 9%

 

16. a) By what rational number should 21 43 be multiplied to obtain 12 23 b) Find the value of x (42x-1 + 10)÷8 = 4

 

17. Find the value of A,B,C A B XBA ▬▬▬▬ (B+1)CB

 

18. Factories (2x2 +3x-9) (4x2 -9x+8) b) x2 -17x+16

 

19. When (x- 1 x ) = 5 , find value of (x2 - 1 x2 )

 

20. solve 9x− 7 (4x+ 2) = 3x+ 4 (4x+ 7)

 

21. A and B can do a piece of work in 15 days; B and C can do it in 12 days while C and A can www.edurite.com finish it 20 days. In how many days will A,B,C finish it working together?

 

22. a) Find the SP when CP = Rs 1580 and gain % = 2% b) Find the CP when SP = Rs 6520 and gain % = 12%

 Oct 13, 2015
 #1
avatar+96368 
+5

Here's some of them :

 

1.  711

2. 349 x 106 =   349,000,000

3. sqrt(5929) = 77

4. sqrt(0.8)  =  0.8944271909999159

5. 6.7  = 670%

9. sqrt (11025) = 105

10. cube root (3325) = 15

15.     521 / 1 .08 = P    where P is the original price he paid = about 482.41R

        So.....1.09 x P = about 525.82 R 

16.  (a) 12.23 /  21.43  

       (b) (42x-1 + 10)÷8 = 4     multiply both sides by 8

             42x - 1 + 10   = 32     simplify

             42x + 9   = 32            subtract 9 from both sides

             42x  = 23                   divide both sides by 42

                 x =  23/42

20. solve 9x− 7 (4x+ 2) = 3x+ 4 (4x+ 7)    simplify on both sides

               9x - 28x - 14  =  3x + 16x + 28  combine like terms

                -19x - `14 =   19x + 28        add 14 to both sides, subtract 19x from both sides

                 -38x = 42    divide both sides by -37

                     x = -42/38  =  -21/19

 

 

 

cool cool cool

 Oct 13, 2015
 #2
avatar+96368 
0

21. A and B can do a piece of work in 15 days; B and C can do it in 12 days while C and A can  finish it 20 days. In how many days will A,B,C finish it working together?

 

Let A, B, C be their work rates.....and we have.....

 

15A + 15B = 1   →      60A + 60B = 4    (1)

12B + 12C = 1   →     60B + 60C = 5     (2)

20A + 20C = 1   →     60A  + 60C  = 3    (3)

 

Subtract equation 3 from equation 1

 

60B - 60C = 1      add this to equation 2

 

120B = 6      B = 20 days to do the job

 

So B does 1/20 of the job in 1 day.....and using equation 1, we have

 

15A  + 15/20 = 1

 

15A  = 1/4    A can do 1/60 of the job in one day

 

And using equation 3, we have

 

20/60 + 20C = 1

 

20C  = 2/3

 

C = 30   so C does 1/30 of the job in one day

 

So, working together, we have

 

[1/20 + 1.60 + 1/30]x = 1

 

[3 + 1 + 2]/ 60  * x = 1

 

6/60 * x   = 1

 

1/10 (x)  = 1       x = 10 days  working together

 

 

 

cool cool cool

 Oct 13, 2015

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