Question
Ratio of two numbers 10:21 and their LCM is 2520. Find
the sum of the given two numbers.Solution
Let the two numbers be '10h' and '21h', where 'h' is the HCF of the two given numbers. Product of two numbers = (Product of LCM and HCF) of the given two numbers 10h × 21h = h × 2520 Or, 210h = 2520 So, 'h' = (2520 / 210) = 12 Therefore, the required sum = 10h + 21h = 31h = 31 × 12 = 372 Hence, option b
112    162    199    ?     242    252
...12, 6, 6, 9, 18, ?
9060 5685 3488 2157 1428 1077
13     26      78      ?     468     936
...3 4.5 6.75 10.125 15.1875 22.78125 ?
...Choose the correct alternative
21: 3 ∷ 574: ?
1, 27, ?, 343, 729, 1331
1331      1000            729       512       ?             216
...37    59    103    191    ?     719
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