Question
The ratio between the number of books and pencils is 6:5
and the ratio of cost of per book and pencil is 4:3 then find the percentage by which total cost of book is greater than the total cost of pencil.Solution
Number = books: Pencil = 6x : 5x Cost = books: pencil = 4y : 3y Total cost = books: Pencil = 24xy : 15xy Required % = [(24xy-15xy)/15xy] × 100 = 60%
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
