Multiple Choice QuestionsA, B and C contract a work for ₹ 440/-. Together A and B are to do 
 of the work. The share of C should be:
A dealer makes a washing machine for ₹ 7,500/- and allows a discount of 6% on it. Find the selling price.
₹ 7050/-
₹ 7250/-
₹ 7250/-
The sum of the cubes of two numbers in the ratio 3 : 4 is 5824. The sum of the number isÂ
(5824)1/3
28
24
24
B.
28
Let the numbers be 3x and 4x respectively.
According to the question,
  (3x)3 + (4x)3 = 5824
  27x3 + 64x3 = 5824
   91x3 = 5824
    x3 = 64 Â
   ⟹ x = 4
∴    Sum of the numbers = 3x + 4x = 7x = 7 x 4 = 28
  Â
In a motor of 120 machine parts, 5% parts were defective. In another motor of 80 machine parts, 10% parts were defective. For the two motors considered together, the percentage of defective machine parts were:
7%
6.5%
7.5%
7.5%
A train, 200 m long is running at a speed of 54 km/hr. The time in seconds that will be taken by train to cross a 175 m long bridge is:
12.5
20
25
25
Which of the following ratios can be the ratio of the sides of a right-angled triangle?
9 : 6 : 3
13 : 12 : 5
7 : 6 : 5
7 : 6 : 5
Number of circles that can be drawn through the non-collinear points is:
exactly one
two
three
three
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