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Question (31)

QN0036701

What is the sum of all odd numbers from 1 to 49?

(A) 576
(B) 600
(C) 625
(D) 650

Correct Answer: C

Explanation:

There are 25 odd numbers. Their sum is 25² = 625.

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Question (32)

QN0036702

A student saves Rs.500 in the first month and increases the saving by Rs.75 every month. How much does the student save in the 12th month?

(A) Rs.1250
(B) Rs.1300
(C) Rs.1325
(D) Rs.1350

Correct Answer: C

Explanation:

a12 = 500 + 11(75) = Rs.1325.

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Question (33)

QN0036703

A person receives a salary of Rs.8000 in the first year and gets an annual increment of Rs.500. What is the salary in the 15th year?

(A) Rs.14000
(B) Rs.14500
(C) Rs.15000
(D) Rs.15500

Correct Answer: C

Explanation:

a15 = 8000 + 14(500) = Rs.15000.

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Question (34)

QN0036704

A person's salary is Rs.8000 in the first year and increases by Rs.500 every year. What will be the salary in the 25th year?

(A) Rs.19000
(B) Rs.19500
(C) Rs.20000
(D) Rs.20500

Correct Answer: C

Explanation:

a25 = 8000 + 24(500) = Rs.20000.

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Question (35)

QN0036705

A principal of Rs.1000 earns simple interest at 8% per annum. The interest earned in successive years forms an AP. What is the interest earned in the 30th year?

(A) Rs.2200
(B) Rs.2300
(C) Rs.2400
(D) Rs.2500

Correct Answer: C

Explanation:

Annual interest is Rs.80. Therefore, the 30th year's interest is 30(80) = Rs.2400.

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Question (36)

QN0036706

A money box contains Rs.100 in the first month and the amount added each month increases by Rs.50. How much is added in the 21st month?

(A) Rs.1000
(B) Rs.1050
(C) Rs.1100
(D) Rs.1150

Correct Answer: C

Explanation:

a21 = 100 + 20(50) = Rs.1100.

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Question (37)

QN0036707

In the money-box pattern 100, 150, 200, ..., what is the total amount added during the first 21 months?

(A) Rs.11500
(B) Rs.12000
(C) Rs.12600
(D) Rs.13000

Correct Answer: C

Explanation:

S21 = 21/2(100 + 1100) = Rs.12600.

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Question (38)

QN0036708

The third and seventh terms of an AP are 600 and 700 respectively. What is its common difference?

(A) 20
(B) 25
(C) 30
(D) 35

Correct Answer: B

Explanation:

a7 - a3 = 4d. Thus, 100 = 4d, giving d = 25.

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Question (39)

QN0036709

In the AP whose third term is 600 and seventh term is 700, what is the first term?

(A) 500
(B) 525
(C) 550
(D) 575

Correct Answer: C

Explanation:

d = 25. Since a3 = a + 2d = 600, a = 600 - 50 = 550.

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Question (40)

QN0036710

For the AP whose third term is 600 and seventh term is 700, what is the 10th term?

(A) 725
(B) 750
(C) 775
(D) 800

Correct Answer: C

Explanation:

a = 550 and d = 25. Therefore, a10 = 550 + 9(25) = 775.

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Question (31)

What is the sum of all odd numbers from 1 to 49?

Explanation:

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Question (32)

A student saves Rs.500 in the first month and increases the saving by Rs.75 every month. How much does the student save in the 12th month?

Explanation:

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Question (33)

A person receives a salary of Rs.8000 in the first year and gets an annual increment of Rs.500. What is the salary in the 15th year?

Explanation:

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Question (34)

A person's salary is Rs.8000 in the first year and increases by Rs.500 every year. What will be the salary in the 25th year?

Explanation:

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Question (35)

A principal of Rs.1000 earns simple interest at 8% per annum. The interest earned in successive years forms an AP. What is the interest earned in the 30th year?

Explanation:

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Question (36)

A money box contains Rs.100 in the first month and the amount added each month increases by Rs.50. How much is added in the 21st month?

Explanation:

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Question (37)

In the money-box pattern 100, 150, 200, ..., what is the total amount added during the first 21 months?

Explanation:

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Question (38)

The third and seventh terms of an AP are 600 and 700 respectively. What is its common difference?

Explanation:

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Question (39)

In the AP whose third term is 600 and seventh term is 700, what is the first term?

Explanation:

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Question (40)

For the AP whose third term is 600 and seventh term is 700, what is the 10th term?

Explanation:

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