Simplify log7 8 - log7 2 + log7 4.
0
2log72
3log72
4log72
Correct answer is D
log7 8 - log7 2 + log7 4
= log7 (8/2 x 4)
= log7 16
= 4 log7 2
39cm ≤ P ≤41cm
38cm ≤ P < 42cm
38.5 ≤ P ≤ 41.5cm
38.5 ≤ P ≤ 40cm
Correct answer is B
If the side = 10 cm, correct to the nearest whole number, then
The side ranges from 9.5 cm to 10.5 cm. (9.5 ≤ s < 10.5)
Perimeter of a rhombus = 4 x side
∴ 4 x 9.5 \leq perimeter < 4 x 10.5
= 38 cm \leq P < 42 cm
Arrange in ascending order of magnitude 26_8, 36_7, and 25_9
25_9 26_8 36_7
26_8 25_9 36_7
36_7 26_8 25_9
36_7 25_9 26_8
Correct answer is B
No explanation has been provided for this answer.
The side of a square is increased from 20cm to 21cm. Calculate the percentage increase in its area
2.5%
9.3%
10.0%
10.25%
Correct answer is D
old area = 202 = 400
new area = 212 = 441
% increase in area =\frac{41}{400}\times \frac{100}{1}\\
=10.25\%
A trader makes a loss of 15% when selling an article. Find the ratio, selling price : cost price
3:20
3:17
17:20
20:23
Correct answer is C
No explanation has been provided for this answer.