খাইরুল স্যারের যে বইগুলো বর্তমানে সারাদেশে পাওয়া যাচ্ছে
1. Khairuls Basic Math (6th Edition)
2. Khairuls Mental Ability (3rd Edition)
3. Khairuls Bank Math (5th Edition Upcoming)
4. Khairuls Bank Written Math (3rd Edition )
5. Khairuls Advanced Math (3rd Edition )

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আমাদের ফেসবুক পেজের লিংক :   / khairulsmath  
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Bangladesh Bank Ltd
Post: Officer Cash
Exam Date: 21-07-2023

1. 2^30 + 2^30 + 2^30 + 2^30 = ?
a.8^30 b.8^120 c.2^32 d.2^30 Ans: c

2. If the sum of 3 consecutive integer is 210, then the sum of the two smaller integer is-
a.139 b.140 c.141 d.Cannot be determined Ans: a

3. If a2 + b2 = 45 and ab = 18, find 1/a + 1/b ?
a. 1/3 b. 1/2 c. 2/3 d. 1/4 Ans: b

4. lf a^x = b and b^y = x then find the value of xy?
a. 1 b. 0 c. a d. y Ans: a

5. Students of a class stand in a queue. If Ratan is 19'h in order from both ends, how many students are there in the queue?
a.20 b. 37 c.38 d.39 Ans: b

6. If 1 is added to the numerator of a fraction, the fraction becomes 1. If 1 is added to the denominator, the fraction becomes Find the fraction.
a.1/3 b.1/2 c.2/3 d.3/4 Ans: c

7. The cost of 9 mangoes and 5 apples is equal to the cost of 7 mangoes and 8 apples. Find the ratio between the cost of 1 mango and the cost of one apple.
a.3:2 b.2:3 c.5:8 d.9:7 Ans: a

8. A shopkeeper has sufficient money to buy 50 books. On reduction in the price of each book by Tk. 4, he could buy 10 books more. How much money does he has?
a.Tk. 1000 b. Tk. 1200 c. Tk. 1500 d. Tk. 2000 Ans: b

9. A man deposits certain amount in his bank account. After a few days. he withdraws half of the money deposited and deposits Tk. 500 more. If he has a balance of Tk. 2000 in his bank account, find the amount deposited initially.
a. Tk. 1500 b. Tk. 2000 c. Tk. 2500 d. Tk. 3000 Ans:d

10. A worker earns Tk. 250 on the first day and spends tk. 200 on the second day, earns Tk. 250 on the third day and again spends Tk. 200 on the fourth day and so no. On which day would he have had Tk. 1000?
a.20th day b.30th day c.31th day d.40th day Ans: d

11. In a group of 135 persons, 50% people contributed tk. 40 each, 30% contributed Tk. 60 each and the remaining persons contributed Tk. 80. Find the average contribution for the group.
a. Tk. 50 b. Tk.54 c. Tk. 60 d. Tk. 62 Ans: b

12. The length of one side of a square inscribed in a circle is 2. What is the area of the circle?
a. b.pie c. d. 2 Ans: d
13. If 4% of (P + Q) are 8 and P is a positive integer. What is the greatest possible value of Q?
a.200 b.199 c.198 d.196 Ans: b

14. Income of A is 25% less than B. What percent B' s income would be more than A?
a.35% b. 33.33% c. 30% d. 25% Ans: b

15. If a rectangle's length and width are both doubled, by what percent is the rectangle's area increased?
a. 50% b. 100% c. 200% d. 300% Ans: d

16. A box contains 90 nuts each of 100 gm and 100 bolts each of 150 gm. If the entire box weighs 35.5 kg, then find the weight of the empty box.
a.10.5kg b. 11kg c. 11.5kg d. 24kg Ans: c

17. A wholesaler bought 1200 radios for Tk. 18 each. The wholesaler sold 60 percent of the radios for Tk. 30 each and the rest for Tk. 15 each. What is the wholesaler's average (arithmetic mean) profit per radio?
a.Tk. 6 b. Tk. 5 c. Tk. 4 d. Tk. 3 Ans: a

18. If a person walks at 14 km/lir instead of 10 km/hr, he can cover 20 km more. The actual distance travelled by him is
a.50km b. 56km c. 70km d. 80km Ans: a

19. Eight people are planning to share equally the cost of a rental car. If one person withdraws from the arrangement and the others share equally the entire cost of the car, then the share of each of the remaining persons will be increased by
a.1/8 b.1/7 c.7/8 d.None of these Ans: b

20. Present age of Fariha is thrice the present age of Samira who is 20. How many years ago was the age of Fariha five times that of Samira?
a.3 b.6 c.7.5 d.10 Ans: d

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