The first five positive even numbers are 2, 4, 6, 8, and 10. Their sum is 30. The mean is 30 / 5 = 6.
87. The ratio of incomes of two persons is 9:7 and the ratio of their expenditure is 4:3. If each of them manages to save Rs 2000 per month. Find their monthly income.
(a) 18000, 14000
(b) 18000, 14000
(c) 27000, 21000
(d) 9000, 7000
Answer:
(a) 18000, 14000
Explanation:
Let incomes be 9x and 7x, and expenditures be 4y and 3y. We have the equations: and $7x – 3y = 2000$. Solving these simultaneously yields $x = 2000$. Therefore, their incomes are and .
88. A motor bike travels 220 km in 5 litres of petrol. How much distance will it cover in 1.5 litres of petrol?
(a) 65 km
(b) 66 km
(c) 67 km
(d) 68 km
Answer:
(b) 66 km
Explanation:
The bike’s fuel efficiency is km per litre. With 1.5 litres of petrol, it will cover km.
89. Marathon is to race as hibernation is to
(a) Sleep
(b) Dream
(c) Bear
(d) Winter
Answer:
(a) Sleep
Explanation:
A marathon is defined as a long, continuous, and extended type of race. Hibernation is a long, continuous, and extended type of sleep.
90. Look at this series: 22, 21, 23, 22, 24, 23, _____ What number should come next?
(a) 22
(b) 24
(c) 26
(d) 25
Answer:
(d) 25
Explanation:
The series alternates by subtracting 1 and adding 2: , , , , . The next operation is to add 2, resulting in .
