EXERCISE 4 (OBJECTIVE TYPE QUESTIONS SOLUTION IN 41 50)

41.       1/X = 4 – (1/3 + ½ )= 4 – (2 + 3/6) = 4 – ( 2 + 3/6) = 4 – 5/6 = 24-5 /6 = 19/6  X = 6/19.

42.       Given exp. = (-2/3 – 1/3 ) + (4/5 +1/5) + (3/4 – 1/2) / (2/3 – 4/3 + 1/3) –( 1/5 + 4/5) + 1/2

=-1 + 1 +1/4 / -1/3 – 1+ 1/2  =  1/4  / -2 -6 +3 / 6  = ¼ / -5/6  = ¼ x (-6/5) = -3/10/

43.       Given exp. = 5 – [ ¾ + { 5/2 – ( ½ + 7-6/42)}] = 5 – [3/4 + {5/2 – (1/2 + 1/42)}

]

= 5 –[3/4 + {5/2 – 22/42}] = 5 – [3/4 + 83 /42] = 5 – 229/84

= (420 – 229/84) = 191/84 = 2 23 /84.

44.       (1/2 – ¼ + 1/5 -1/6) /(2/5 – 5/9 + 3/5 – 7/18) = (30 – 15 + 12 – 10) 60 / (2/5 + 3/5 ) – ( 5/9 + 7/18) = (17 / 60 x 18) = 51 / 10 = 5 1/10.

45.       (34 x 4 ½ ) = 34 x (4 +1/2) = (34 x 4) + (34 x ½)

=(30 + 4) x 4 + (34 x 1/2) = ( 30 x 4) + ( 4 x 4) + ( 34 x ½).

46.       Given exp. = (3 / 5 x 4/7 x 5/ 9 x 21/ 24 x 504) =84.

47.       Given exp. = (41 /6 x 16 / 3 + 53 / 3 x 9/2) = (328 / 9 +159/2) = 656 + 1431 /18 =2087 / 19 = 115 17/18.

48.       Let 3/8 of 168 x 15 + 5 + X= 549 ÷ 9 + 235.

Then, 63 x 15 ÷ 5 + X = 61  + 235

63 x 3 + X = 296

189 + X = 296

X = 107.

49.       Let 5/3 ÷ 2/7 x X/7 = 5/4 x 2/3 ÷ 1/6. Then,

5/3 x 7 / 2 x X/7 = 5 /4 x 2/3 x 6

5/6 X = 5

X = (5 x 6 / 5 ) =6.

50.   Let 5 2/3 ÷ X 5/6 = 2. Then. 17/3 ÷X 5/6 = 2

       X 5/6 = 17/3 x ½ = 17/6

        X 5/6 = 2 5/6.

X = 2.