The cost of dinner for a group of students is partly cons...
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
N68.50
N63.00
N60.00
N52.00
Correct answer is B
C = a + kS. If C = 74, S = 20
C = 96, S = 30, C= ? S = 15
74 = a + 20k......(1)
96 = a + 30k......(2)
subtract equation (1) from (2)
96 = a + 30k
-
74 = a + 20k
--------------
22 = 10k
k = 2.2
find a
74 = a + 44
a = 30
C = 30 + 2.2S
when S = 15, C = 30 + 2.2 x 15
= 30 + 33
= N63
Solve the following equations 4x - 3 = 3x + y = x - y = 3, 3x + y = 2y + 5x - 12 ...
Simplify log10 a\(\frac{1}{3}\) + \(\frac{1}{4}\)log10 a - \(\frac{1}{12}\)log10a7...
Factorize abx2 + 8y - 4bx - 2axy...
An arc of length 22cm subtends an angle of θ at the center of the circle. What is the value of...
Two fair coins are tossed at the same time. what is the probability of getting a head? ...
The figure FGHK is a rhombus. What is the value of angle X? ...