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Side of chessboard = 8 × 2
= 16 cm.
Perimeter of chessboard = 20 × 4
= 80 cm
The perimeter of floor of a square room is 230 m and height of the room is 5 m. The cost of painting the walls of the room at Rs. 7.50 /m² is:
Two boats A and B start towards each other from two places, 273 km apart. Speed of the boats A and B in still water are 22 km/hr. and 17 km/hr. respectively. If a proceeds down and B up the stream, then will meet after how many hours?
A number is first decreased by 10% and then increased by 10%. The number so obtained is 100 less than the original number. The original number is:
Two unbiased coins are tossed. What is the probability of getting at most one head?
Total outcomes = (HH, HT, TH, TT)
Favorable outcomes = (TT, HT, TH)
At most one head refers to a maximum one head,
Therefore, probability = 3⁄4.
At what time between 4 and 4.59 will the hands of a watch point in opposite directions?
At 4 o'clock, the hands of the watch are 20 min. spaces apart.
To be in opposite directions, they must be 30 min. spaces apart.
Minute hand must gain 50 min. spaces.
55 min. spaces are gained in 60 min.
50 min. spaces are gained in 60/55 x 50 = 54 (6/11) min
10 11 26 87 364 ?
Series Pattern Given Series
10 10
10 × 1 + 12 11
11 × 2 + 22 26
26 × 3 + 32 87
87 × 4 + 42 364
364 × 5 + 52 1845 ✓
200 220 484 1597.2 7027.68 ?
200 200
200 × 1.1 220
220 × 2.2 484
484 × 3.3 1597.2
1597.2 × 4.4 7027.68
7027.68 × 5.5 38652.24 ✓
Evaluate
6202.5 + 620.25 + 62.025 + 6.2025 + .62025
Arrange fractions in descending order
9/11 = .818 , 8/9 = .88 , 3/5 = .6, 4/7 = .571
So order is 8/9 > 9/11 > 3/5 > 4/7
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