EXERCISE 4 (OBJECTIVE TYPE QUESTIONS SOLUTION IN 11 20)

11.       Given exp. = 2 – [2 –{2 – 2 x 4}] = 2 – [2 – {2 -8}] = 2 –[2 –(-6)]

= 2 – [2 + 6] = 2 – 8 = -6.

12.       Given exp. = 25 – 5 [2 + 3 {2 -2 x 2 + 5} – 10] ÷4

= 25 – 5 [ 2 + 3 [ 2 + 3 {2 – 4 + 5} – 10] ÷4 = 25 – 5 [ 2 + 3 x 3 – 10] ÷4

=25 – 5 [ 2 + 9 – 10 ] ÷4 = 25 - 5÷4 = 25 – 1.25 = 23. 75.

13.       Given exp. = 260 x 16 + 340 = 4160 + 340 =4500.

14.       Given exp. 100 x 10 – 100 + 20 = 1000 – 100 + 20 = 1020 – 100=920.

15.       Let 2 X 6 – 12 ÷4 +2 = 11. Then, 2 X 6 – 3 + 2 =11  2 x 6 = 11 + 3 – 2 =12.

So, X must be replaced by ‘X’.

16.       Let 45 – [28 – {37 – 15 – X)}] = 58    45 – [28 –{22 + X}] = 58.

= 45 – [28 -22 –X] = 58          45 – [6 –X]       45 – 6 + X = 58

39 + X = 58         X =58 – 39 = 19.

17.       Given exp. 24 ÷6 / 4 + 4 + 4 + 1  =4/13.

18.       Given exp. =4 + 72 -6 – 8 / 738 -730 = 76 – 14 / 8 = 62 / 8 = 7. 75.

19.       Given exp. = 2700 – 240/ 1120 + 110 = 2460/ 1230 = 2.

20.   Let 128 ÷ 16 x X – 7 x 2 / 7² - 8 x 6  + x X² = 1.