২২৮৯১
If the sum of (3, 7 and x) is 18, then the average of (3, 7 and x) is
উত্তর
6
সমাধান
3+7+x=18x=8average=3+7+8/3=6
২২৮৯২
Out of a group of 80 applicants for a public service examination, 20 persons failed to appear for the first part of the test. What percent of the total applicants appeared for this part of the test?
উত্তর
75
সমাধান
Appeared applicants = 20/80×100% = 75%
২২৮৯৩
Mr. Rahim who is 28 years of age has a son who is 4 years old. In how many years will Mr. Rahim be 4 times as old as his son?
উত্তর
4
সমাধান
Let, after x years Mr. Rahman will be 4 times as old as his son.
So,
4(4 + x) = 28 + x
or, 16 + 4x = 28 + X
or, 4x - x = 28 - 16
or, 3x = 12
or, x = 4
Therefore, after 4 years Mr. Rahman will be 4 times as old as his son and that is answer option (d).
২২৮৯৪
Mr. X bought a dozen of apples for Tk. 18. He sells two apples at the purchase price of 3 apples. What is the selling price of a dozen apples?
উত্তর
27
সমাধান
১২ টির ক্রয়মূল্য = ১৮ টাকা১ টির ক্রয়মূল্য = ১৮/১২ টাকা৩ টির ক্রয়মূল্য = ১৮×৩১২ = ৯২টাকা এখন, ২ টির বিক্রয়মূল্য = ৯২ টাকা ১ টির বিক্রয়মূল্য = ৯২×২ ১২ টির বিক্রয়মূল্য = ৯×১২২×২ = ২৭ টাকা (উত্তর)
২২৮৯৫
Present ages of Saleh and Anu are in the ratio of 5:4 respectively. Three years later, the ratio of their ages will become 11:9 respectively. What is Anu's present age in years?
উত্তর
24
সমাধান
Let, present age of Saleh = 5X present age of Anu = 4Xas per condition, 5X+34X+3 = 119 45X+27 = 44X+33 X = 6 So, the Anu's present age is = 4*6 = 24 years (Ans)
২২৮৯৬
Sakib's weekly salary is Tk. 70 less than Javed's , whose weekly salary is Tk. 50 more than Samir's. If Samir earns tk. 280 per week, how much does Sakib earn per week?
উত্তর
260
সমাধান
Sakib = Javed - 70Javed = Samir + 50 = (280 + 50) tk as Samir = 280tk = 330 tk now, Sakib = Javed - 70 = 330-70 = 260 (Ans.)
২২৮৯৭
Salaries of A, B and C are in the ratio 2:4:6. Salary of Band C together is Tk. 12,000 By what percent is salary of C more than that of A?
উত্তর
200
সমাধান
Let, A as 2X, B as 4X, C as 6X4X+6X = 1200X = 1200now, Salary of A = 2X = 2400 Salary of C = 6X = 7200C's salary is higher than A = 7200 - 2400 = 4800now, C = A * P% 4800 = 2400 * P100 P = 200C salary is 200% more than that salary of A (Ans.)
২২৮৯৮
The population of a town was 160,000 three years ago. If it is increased by 3%, 2.2% and 5% respectively in the last three years, then the present population of the town is:
উত্তর
1,77,366
২২৮৯৯
The sum of two numbers is 12 and their product is 35. What is the sum of reciprocals of these numbers?
উত্তর
12/35
সমাধান
Let the two numbers be x and y
x + y = 12
and, xy = 35
Now, 1/x + 1/y = (y + x)/xy = 12/35
২২৯০০
A hostel spends Tk. 3200 as cost of rice 20 students for 30 days. If they spend Tk. 2400 for 30 students, for how many days will the rice last?
উত্তর
15 days
সমাধান
৩২০০ টাকায় ২০ জন ছাত্রের খাবার আছে = ৩০ দিনের৩২০০ টাকায় ১ জন ছাত্রের খাবার আছে = ৩০*২০ দিনের৩২০০ টাকায় ৩০ জন ছাত্রের খাবার আছে = 30×2030 দিনের২৪০০ টাকায় ৩০ জন ছাত্রের খাবার আছে = 30×20×240030×3200দিনের = ১৫ দিনের (উত্তর)