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(A) 1 : 20
(B) 1 : 25
(C) 1 : 40
(D) 1 : 80

The answer is: (A) 1 : 20
Solution
The ratio of 20cm and 4m is: 20cm/4m = 20cm/400cm (1 meter = 100 centimeters)
Hence, ratio = 20/400 = 1/20 = 1:20

(A) 1:20
(B) 1:25
(C) 1:40
(D) 1:80

The answer is: (D) 1:80
Solution
The ratio of 50m and 4km is: 50m/4km = 50m/4000m (1 kilometer = 1000 meters)
Hence, ratio = 50/4000 = 1/80 = 1:80

(A) 180
(B) 182
(C) 184
(D) 186

The answer is: (C) 184
Solution
As, Cost + Profit = Selling Price. Therefore,

Q. What is the solution set of the equation: x²+4x+3=0
(A) {1, 3}
(B) {–1, 3}
(C) {1, –3}
(D) {–1, –3}

The answer is: (D) {–1, –3}
Solution

(A) 4 km/hr
(B) 5 km/hr
(C) 6 km/hr
(D) 7 km/hr

The answer is: (D) 7 km/hr
Solution
Total Distance = 9km + 12km = 21 km. And, Total Time = 1 hour 20 + 1 hour 40 = 3 hours. Hence, Average Speed is

(A) 4
(B) 5
(C) 6
(D) 7

The answer is: (B) 5
Solution
Out of 4 options only one is correct. So,

(A) 180
(B) 182
(C) 184
(D) 186

The answer is: (C) 184
Solution
As we know that, Cost + Profit = Selling Price. Hence,

(A) 3-2x
(B) 1-2x
(C) 2x-1
(D) (x+3)/2

The answer is: (D) (x+3)/2
Solution

Q. What is: |2| – |–2| – 2² – (–2)² = ?
(A) –8
(B) –6
(C) –4
(D) –2

The answer is: (A) –8
Solution