Question
The breadth of a rectangular hall is 8/25 of its length.
If the area of the floor is 200 sq. m., then the difference between the length and breadth of the hall is:ÂSolution
Using formula Area = lb, Let the length of rectangular hall = x metre Therefore, Breadth = (8x/25) metre Area of rectangle = Length x Breadth ⇒ (8x/25) × x ⇒ 8x2/25 m2 According to question, ⇒ 8x2/25 = 200 Therefore, x2 = (200 x 25)/8 or, x = √{(200 x 25)/8} = 25 m Therefore, Length = 25 m and Breadth = 8 m Therefore, required difference = 25 – 8 = 17 m
What value should come in the place of (?) in the following number series?
15, 21, ?, 41.16, 57.624
What will come in place of the question mark (?) in the following series?
15, 26, 39, 56, ?, 98
51    52    48     57    ?      66      30
...165      155     135     ?     65      15
...38% of 18/225 of 31/19 of 15225 =?
86, 127, ?, 209, 250, 291
15.5, 62, 186, ?, 2232, 8928
52   83   114   ?   176    207
Complete the series choosing the missing number.
110, 99, 86, ___, 54, 35.
16, 20, 11, 27, ?, 38
