২৩৩৩১
what is the maximum percentage discount that a merchant can offer on her Marked price so that she ends up selling at no profit or loss, if she had initially marked her goods up by 50%?
উত্তর
33.33%
সমাধান
Let the actual price be A.
Marked up price = A + 50% of A = A + 0.5A = 1.5A
Maximum discount possible = (1.5A - A) / (1.5A) × 100% = 33.33%
২৩৩৩২
A man can hit a target once in 4 shots. If he fires 4 shots in succession , what is the probability that he will hit his target?
উত্তর
1/256
সমাধান
Probability,
14×14×14×14 = 1256
২৩৩৩৩
In a class 40% of the students enrolled for Math and 70% enrolled for Economics. If 15% of the students enrolled for both Math and Economics, what % of the students of the class did not enroll for either of the two subjects?
উত্তর
5%
সমাধান
Only enrolled for math = 40 - 15 = 25%
" " economics = 70 - 15 = 55%
In both enrolled = 25% + 55% + 15%
= 95%
⸫ Did not enrolled = 100 - 95 = 5%
২৩৩৩৪
How many diagonals does a 63 - sided convex polygon have?
উত্তর
1890
সমাধান
No of diagonals
C263 - 63 = 1890 (Ans)
২৩৩৩৬
If p = the number of months in 7 years and q = the number of days in 12 weeks
উত্তর
p = q
সমাধান
p = No of months in 7 years = 12×7 = 84q = No of months in 12 weeks = 7×12 = 84
২৩৩৩৭
The average of x and y is 20. If z = 5 , what is average of x, y and z?
উত্তর
15
সমাধান
Sum of x and y = 20×2 = 40
Average of x, y and z = (40 + 5)/3 = 15
২৩৩৩৮
The smallest prime number greater than 20 is
উত্তর
23
সমাধান
মৌলিক সংখ্যা হলো সেই সংখ্যা যাদেরকে ১ অথবা ঐ সংখ্যা ছাড়া অন্য কোনো সংখ্যা দিয়ে ভাগ করা যায় না
২৩৩৩৯
If the average of 5 consecutive integers is 12 , what is the sum of the least and the greatest of the integers?
উত্তর
24
সমাধান
let, 5 consecutive numbers are x, (x + 1), (x + 2), (x + 3), (x + 4) = x + (x + 1) + (x + 2) + (x + 3) + (x + 4) = 12×5⇒5x + 10 = 60⇒5x = 50∴ x = 10∴x + 4 = 10 + 4 = 14∴ The of the least and the greatest of the integer 14 = 10 + 14 = 24
২৩৩৪০
In a certain shop, notebooks that normally sell for BDT 1.50 each are on sale at 2 for BDT 2.89. How much can be saved by purchasing 10 of these notebooks at the sale price?
উত্তর
BDT 0.55
সমাধান
Price of 1 note books BDT 1.50∴ " " 10 " " " 1.50×10 = BDT 15Again, Price of 1 note books BDT 2.89∴ " " " 5 " " " = 2.89×5 = BDT 14.45Saved = 15 - 14.45 = BDT 0.55