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Mathematics 1998 WAEC Past Questions

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61
A trader makes a loss of 15% when selling an article. Find the ratio, selling price : cost price
  • A. 3:20
  • B. 3:17
  • C. 17:20
  • D. 20:23
View Answer & Discuss (7) WAEC 1998
62
The side of a square is increased from 20cm to 21cm. Calculate the percentage increase in its area
  • A. 2.5%
  • B. 9.3%
  • C. 10.0%
  • D. 10.25%
View Answer & Discuss (1) WAEC 1998
63
Arrange in ascending order of magnitude \(26_8, 36_7, and 25_9\)
  • A. \(25_9 26_8 36_7\)
  • B. \(26_8 25_9 36_7\)
  • C. \(36_7 26_8 25_9\)
  • D. \(36_7 25_9 26_8\)
View Answer & Discuss (5) WAEC 1998
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64

A, B and C are subsets of the universal set U such that : \(U = {0, 1, 2, 3,..., 12}; A = {x : 0 \leq x \leq 7}; B = {4, 6, 8, 10, 12}; C = {1 < y < 8}\), where y is a prime number.

(a) Draw a venn diagram to illustrate the information given above;

(b) Find: (i) \((B \cup C)'\); (ii) \(A' \cap B \cap C\).

View Answer & Discuss WAEC 1998
65

(a) Given that \(\log_{10} 2 = 0.3010, \log_{10} 7 = 0.8451\) and \(\log_{10} 5 = 0.6990\), evaluate without using logarithm tables:

(i) \(\log_{10} 35\); (ii) \(\log_{10} 2.8\).

(b) Given that \(N^{0.8942} = 2.8\), use your result in (a)(ii) to find the value of N.

View Answer & Discuss WAEC 1998
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