81. What is the LCM of (8x3 + 80x2 + 200x) and (4x4 + 16x3 - 20x2)?
82. The H.C.F. of two numbers is 8. Which one of the following can never be their L.C.M.?
83. The HCF of two number 12906 and 14818 is 478. Their LCM is:
84. Find the least multiple of 23, which when divided by 18, 21 and 24 leaves the remainder 7, 10 and 13 respectively.
85. Find the LCM of 34 × 52 × 72 × 11, 33 × 5 × 7 × 112 and 32 × 53 × 114.
86. The sum of and difference between the LCM and HCF of two numbers are 512 and 496, respectively. If one numbers is 72, then the other number is:
87. Two numbers are in the ratio 7 : 11. If their HCF is 28, then the sum of the two numbers is:
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