18) Find the value of[log10√25 – log10 (23)+log10(4)2]x(a) x(b) 10(c) 1(d) None
19) 1 + 1 + 1logab(abc) logbc(abc) logca(abc)equal to :(a) 0(b) 1(c) 2(d) 1
20) If n = m! where ( m is a positiveinterger > 2) then the value of :1 + 1 + 1 + 1log2 n log3 n log4 n logm n(a) 1(b) 0(c) -1(d) 2
21) A bag contains Rs. 187 in the formof 1 rupee, 50 paise and 10 paise coinsin the ratio 3:4:5. Find the number ofeach type of coins:(a) 102, 136, 170(b) 136, 102, 170(c) 170, 102, 136(d) None
22) The recurring decimal 2.77777.......can be expressed as :(a) 24/9(b) 22/9(c) 26/9(d) 25/9
23) In what ratio should tea worth Rs.10 per kg be mixed with tea worthRs. 14 per kg, so that the averageprice of the mixture maybe Rs. 11per kg ?(a) 2:1(b) 3:1(c) 3:2(d) 4:3
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