২৩০২১
In a class of 80 students, 25% are girls, If 10% of the boys and 20% of the girls attended a picnic, what percent of the class did attent?
উত্তর
12.5%
সমাধান
Percentage of class attending picnic = 20% of 25% + 10% of 75% = 5% + 7.5% = 12.5%
২৩০২২
Three business partners Q, R, and S, agree to divide their total profit for a certain year in the ratios 2: 5: 8, respectively. If Q's share was Tk. 4000, what was the total profit of the business partners for the year?
উত্তর
Tk. 30,000
সমাধান
Individual profit of Q,R and S are 2x, 5x, 8xSum of total profit = 2x + 5x + 8x = 15x now, 2x = 4000tk x = 4000/2 = 2000tk 15x = (2000*15) tk = 30,000tk (Ans.)
২৩০২৩
If x=12, which one has the least value ---
উত্তর
2-x
সমাধান
2 - x = 2 - 12 = - 10 [ সবচেয়ে ছোট মান ]
2/x = 2/12 = 0.16667
x/2 = 12 /2 = 6
x - 2 = 12 - 2 = 10
২৩০২৪
A restaurant meal costs Tk. 35.50 and there was no tax. If the tip was more than 10 percent but less than 15 percent of the cost of meal, then the total amount paid must have been between --
উত্তর
Tk. 39 and Tk. 41
২৩০২৫
Arif spends 1/10 of his salary for clothing, 1/3 for food, and 1/5 for other expenses. What percentage of his salary can Arif save?
উত্তর
36.66%
সমাধান
Savings = 1 - (1/10 + 1/3 + 1/5) = 1 - (3 + 10 + 6)/30 = 1 - 19/30 = 11/30 = 36.66%
২৩০২৬
Hashem wants to put up fencing around three sides of his rectangular yard and leave a side of 20 feet unfenced. If the yard has an area of 680 square feet, how many feet of fencing does he need?
উত্তর
88
২৩০২৭
The selling price of 4 pencils is equal to the purchase price of 5 pencils. What is the profit margin?
উত্তর
25%
সমাধান
Let's say the purchase price of 5 pencil is 1 taka.
Then purchase price of 1 pencil is 1/5 taka and selling price of 1 pencil is 1/4 taka.
Profit margin = {(1/4 - 1/5)/ (1/5)} x 100% = 25%.
২৩০২৮
দুটি সংখ্যা গুণফল ১৫৩৬। সংখ্যা দুটোর ল.সা.গু ৯৬ হলে গ.সা.গু কত?
উত্তর
16
সমাধান
ব্যাখাঃ ল, সা, গু × গ, সা, গু = দুটি সংখ্যার গুনফল
গ, সা, গু = দুটি সংখ্যার গুনফল / ল, সা, গু
= ১৫৩৬/ ৯৬ = ১৬ (উত্তর)
২৩০২৯
Increasing the original price of an article by 15 percent and then increasing the new price by 15 percent is equivalent to increasing the original price by ---
উত্তর
32.25%
সমাধান
required number = 15 + 15 + 15×15100 = 15 + 15+ 2.25 = 32.25 (Ans)
২৩০৩০
The result of subtraction of two numbers is equal to 3/7 of their sum. If the smaller number is 6, what is the other number?
উত্তর
15
সমাধান
Let the greater number is = x
and the smaller number is = y
According to the question,
x - y = 3/7 (x + y)
or, 7x - 7y = 3x + 3y
or, 7x - 3y = 3y + 7y
or, 4x = 10y
or, 4x = 10*6 [As the smaller number is 6]
or, 4x = 60
or, x = 15
Ans: The greater number is 15