# Mathematics 2018 Past Questions | WAEC

Study the following Mathematics past questions and answers for JAMB, WAEC NECO and Post-JAMB. Get prepared with official past questions and answers for upcoming examinations.

- Simplify: \(\sqrt{108} + \sqrt{125} – \sqrt{75}\)

**A.**\(\sqrt{3} + 5\sqrt{5}\)**B.**\(6 \sqrt{3} – 5 \sqrt{5}\)**C.**\(6 \sqrt{3} + \sqrt{2}\)**D.**\(6\sqrt{3} – \sqrt{2}\)

**2. **Evaluate: \((64^{\frac{1}{2}} + 125^{\frac{1}{3}})^2\)

**A.**121**B.**144**C.**169**D.**196

**3. **Given that y varies inversely as the square of x. If x = 3 when y = 100, find the equation connecting x and y.

**A.**\(yx^2 = 300\)**B.**\(yx^2 = 900\)**C.**y = \(\frac{100x}{9}\)**D.**\(y = 900x^2\)

**4. **Find the value of x for which \(32_{four} = 22_x\)

**A.**three**B.**five**C.**six**D.**seven

**5. **Simplify; 2\(\frac{1}{4} \times 3\frac{1}{2} \div 4 \frac{3}{8}\)

**A.**\(\frac{5}{9}\)**B.**1\(\frac{1}{5}\)**C.**1\(\frac{1}{4}\)**D.**1\(\frac{4}{5}\)

**6. **There are 250 boys and 150 girls in a school, if 60% of the boys and 40% of the girls play football, what percentage of the school play football?

**A.**40.0%**B.**42.2%**C.**50.0%**D.**52.5%

**7. **If \(\log_{10}\)(6x – 4) – \(\log_{10}\)2 = 1, solve for x.

**A.**2**B.**3**C.**4**D.**5

**8. **If F = \(\frac{9}{5}\)C + 32, find C when F = 98.6

A. 30

B. 37

C. 39

D. 41

**9. **If y + 2x = 4 and y – 3x = -1, find the value of (x + y)

**A.**3**B.**2**C.**1**D.**-1

**10. **If x : y : z = 3 : 3 : 4, evaluate \(\frac{9x + 3y}{6x – 2y}\)

**A.**1\(\frac{1}{2}\)**B.**2**C.**2\(\frac{1}{2}\)**D.**3