Question
A cuboidal water tank has dimensions (20 × 14 × 12) cm
and is open from the top. If painting the outer surface costs Rs. 5 per cm², find the total painting cost.Solution
ATQ, Area to be painted = lateral surface area + area of base = 2 × (length + breadth) × height + length × breadth = 2 × (20 + 14) × 12 + 20 × 14 = 2 × 34 × 12 + 280 = 816 + 280 = 1,096 cm² Required cost = 1,096 × 5 = Rs. 5,480
Find the wrong number in the given number series.
120, 126, 138, 162, 220, 306
217Â Â Â Â 210Â Â Â Â Â 236Â Â Â Â Â 299Â Â Â Â Â 423Â Â Â Â 640
...112, 222, 440, 872, 1717 , 3424
In each of the following giving number series, a wrong number is given. Find out the wrong number?
82, 81, 86, 110, 168, 287
- 78, 86, 71, 95, 60, 112
2100, 2140, 2186, 2240, 2300, 2372
9, 10, 12, 18, 42, 160
A-5,  A,  35,  52, 78, 115
Find the wrong number in the given number series.
233, 206, 183, 152, 125, 98
Find the wrong number in the given number series.
2, 4, 12, 48, 120, 1440
