71. The HCF of two numbers is 29, and the other factors of their LCM are 15 and 13. The larger of the two numbers is:
72. Three numbers are in the proportion of 3 : 8 : 15 and their LCM is 8280. What is their HCF?
73. A and B are two prime numbers such that A > B and their LCM is 209. The value
of A2 - B is:
74. Find the LCM of 186.6 and 373.2.
75. 13, a, b, c are four distinct numbers and the HCF of each pair of numbers (13, a) ; (13, b) ; (13, c) is 13, where a, b, c are each less than 60 and a < b < c. What is the value of $$\frac{{{\text{a}} + {\text{c}}}}{{\text{b}}}?$$
76. Three numbers are in the ratio. $$\frac{1}{2}:\frac{2}{3}:\frac{3}{4}.$$ If the difference between the greatest number and the smallest number is 33, the HCF of the three numbers is:
77. Calculate the HCF of $$\frac{{12}}{5},\,\frac{{14}}{{15}}$$ and $$\frac{{16}}{{17}}.$$
78. What is the least number of square tiles required to pave the floor of a room 15 m 17 cm long and 9 m 2 cm broad ?
79. Find the smallest 5-digit number which when divided by 15, 20 and 25 leaves remainders 7, 12 and 17, respectively.
80. The least multiple of 13, which on dividing by 4, 5, 6, 7 and 8 leaves remainder 2 in each case is
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