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UNIUYO MATHEMATICS POST UTME SOLUTIONS
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Qst 1: Given that (1x03)4 = 11510 find x.
Solution
We can solve the above
Number base problem using either of two methods;
Method 1: Equate both sides of the equation. First, convert the
L.H.S of the Equation to base ten (10) just as the R.H.S.
Converting (1x03)4
to base 10,
1 * 43 + x *
43 + 0 * 41 + 3 * 40
64 + 16x + 0 + 3
(67 + 16x)10
Now, equate the L.H.S
with the R.H.S. So we have,
6710 + 16x10
= 11510 [same base]
16x10 = 11510
- 6710
= 48 [ignoring the bases, or cancelling them out]
16x = 48,
X = 48/16 = 3
Therefore, x = 3. [Answer,
OPTION C]
Method 2
The above problem may
also be solved by comparing the place values of the L.H.S with that of the
R.H.S. To do this, first convert the R.H.S to base 4 using the long division
method, thus:
4
|
115
|
R
|
4
|
28
|
3
|
4
|
7
|
0
|
4
|
1
|
3
|
0
|
1
|
Reading the values up,
the normal way, we have that 11510 = 13034
Now, comparing both
sides of the equation,
1x034 = 13034
As you can see, the place
value of “x” in the L.H.S equals the Place value of “3” in the R.H.S
Hence, x = 3. [Answer, OPTION C]
Qst 2: A motorist starts from point O and moves on a bearing of 0300
for 48km. He then moves 10km toward the west. How far is he now from O?
Solution
To solve the above problem, we need a small trigonometric sketch of the
event described. Thus,
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