Variation Jamb Mathematics Past Questions
Question 21
T varies inversely as the cube of R. When R = 3, T = \(\frac{2}{81}\), find T when R = 2
- A. \(\frac{1}{18}\)
- B. \(\frac{1}{12}\)
- C. \(\frac{1}{24}\)
- D. \(\frac{1}{6}\)
Question 22
If x is inversely proportional to y and x = 2\(\frac{1}{2}\) when y = 2, find x if y = 4
- A. 4
- B. 5
- C. 1\(\frac{1}{4}\)
- D. 2\(\frac{1}{4}\)
Question 23
W is directly proportional to U. If W = 5 when U = 3, find U when W = \(\frac{2}{7}\)
- A. \(\frac{6}{35}\)
- B. \(\frac{10}{21}\)
- C. \(\frac{21}{10}\)
- D. \(\frac{35}{6}\)
Question 24
If w varies inversely as \(\frac{uv}{u + v}\) and is equal to 8 when
u = 2 and v = 6, find a relationship between u, v, w.
- A. uvw = 16(u + v)
- B. 16ur = 3w(u + v)
- C. uvw = 12(u + v)
- D. 12uvw = u + v
Question 25
The cost of dinner for a group of students is partly constant and partly varies directly as the number of students. If the cost is N74.00 when the number of is 20 and N96.00 when the number is 30, find the cost when there are 15 students
- A. N68.50
- B. N63.00
- C. N60.00
- D. N52.00
