SOLUTION IN 11 TO 20.

11.         7429                   let 8597 – X = 3071

-                                  4558              then,   X= 8597 – 3071             8579

                        3071                                                                   -3071

                                                                                                       5526

12.       3251                             let 4207 –X =3007

                                       Then, X = 4207 – 3007 = 1200.

                     +587

                      +369

                                       4207

13.       Let 4300731 – X =2535618

                                Then, X =4300731 – 2535618

                    4300731

                  -2535618

                    1765618

14.       19657                              let X -53651 =9999

                               33994                                         then, X = 9999 + 53651 + 9999 + 1+ 53650

                           53651                                                 =10000 + 53650 = 63650

                                      

15.           3

                             +   33

                                 + 333

                             +      3.33

                                    372.33

16.       Given sum = 9+ 3/4+ 7 + 2/17 (9+1/15)

                            = (9+ 7 -9) + (3/4+ 2/17 + 1/15)

                                  = 7+ 765 + 120 – 68        = 7 817

                                                                 1020                       1020

17.       Given exp. =-84 x (30 – 1) + 365

                                      = - (84 x 30) +84 + 365

                                       = - 2520 + 449 = -2071

                                         -2520

                                          + 449

                                         -2071

                                        = -2071

18.       35423   317 x 89 =317 x (90 – 1)

                                      +7164 = (317 x 90 – 317)

                                                     +41720 = (28530 – 317) = 28213

                                                     84307

                                                    -28213

                                                    54094

19.       9548 16862 =8362 + X X = 16862 – 8362 = 8500.

                                          +7314

                                                   16862

20.   X + 3699 + 1985 – 2047 = 31111

                         X + 3699 + 1985 = 31111 + 2047

                            X + 5684 = 33158                                                             33158

                                              X = 33158 – 5684 =27474.                                            -5684

                                                                                                                                 27474