Question
The sum of the length, width, and height of a cuboid is
30 cm. If the length of the diagonal of the cuboid is 25 cm, find the total surface area of the cuboid.Solution
l+ b+ h = 30 Diagonal =25 Diagonal = √l2+b2+h2 (l+ b+ h)2 = l2+b2+h2+ 2(l b+ b h +h l) (30)2 = (25)2 +2(l b+ b h +h l) 900 = 625 +2(l b+ b h +h l) 2(l b+ b h +h l) = 900-625=275 Total surface area of cuboid =275 cm2
12, 13, 27, 82, 329, ?
58, 63, 78, ?, 138, 183
3, 5, 12, 38, 154, ?
What will come in place of the question mark (?) in the following series?
1458, ?, 162, 54, 18, 6
What will come in the place of questions (?) mark in the following questions.
40, 25, 30, 50, 105, ?
11    16    42    141    ?   2945   17700
...43          86          258        ?             5160                     30960
...Find the missing number in the given number series.
4, ?, 110, 665, 4660, 37285
7, 9, 21, ?, 107, 197
58   83   133   ?    308    433
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