২২৪৭১
Danny attended a test containing 40 questions. If he had corrected 18 questions out of the first 22 and two-third of the remaining questions, what percent of all the questions did he answer correctly?
উত্তর
75%
সমাধান
Danny attended a test containing 40 questions. If he had corrected 18 questions out of the first 22 and two - third of the remaining questions, what percent of all the questions did he answer correctly?
Total number of correctly answered questions = 18 + 2/3 of (40 - 22)
= 18 + 2/3 of 18 = 18 + 12 = 30
Percentage of correctly answered questions = 30 / 40 x 100% = 75%
২২৪৭২
What is the averate fo 0.36, 4.6, 0.64, and 2.4?
উত্তর
2
সমাধান
0.36 + 4.6 + 0.64 + 2.4 = 8
= 8/4
= 2
চারটি সংখ্যার যোগফল ৮ এবং চারটি সংখ্যার কারণে ৪ দিয়া ভাগ হবে।
২২৪৭৩
If a pipe fills a tank in h hours what part of the tank does it fill in 2 hours?
উত্তর
2/h
সমাধান
If it takes x hours to fill a tank, i.e. to fill 1 tank, then in 1 hour, it'll fill 1x of the tank.
then in 2 hours, it'll fill 2x of the tank.
Ans: 2x
২২৪৭৪
Bonds Telecom sold 140 SIM cards for Tk. 250 each, 120 SIM cards for Tk. 215 each and 50 SIM cards for TK. 200 each. If each. SIM card costs TK. 220 , what was Bond's profit or loss?
উত্তর
Tk. 2,600 profit
সমাধান
Total number of sold SIM cards = 140 + 120 + 50 = 310
Total cost of SIM cards = 310 x 220 = 68200 TK
Revenue from sell = 140 x 250 + 120 x 215 + 50 x 200 = 70800
Profit = 70800 - 68200 = 2600 TK
২২৪৭৫
A bag of chicken feed can feed 18 chickens for 54 days. For how many days will it feed 12 chickens?
উত্তর
81
সমাধান
18 chickens can feed for = 54 days1 chicken can feed for = (54*18) days12 chickens can feed for = (54*18)/12 days = 81 days
২২৪৭৬
An athlete running at 24 km /hr crosses a square field diagonally in 3 minutes. what is the area of the field?
উত্তর
720,000m2
সমাধান
Speed = 24 km/hr
Time = 3 min = 3/60 hr = 1/20 hr
Diagonal length of the field = 24 x 1/20 = 1.2 km = 1200 m
Side of the square field = 1200/√2 = 848.53 m [Diagonal of square = √2 x side length]
So, area of the field = 848.532 m2 ≈ 720000 m2
২২৪৭৭
A salesman travels a distance of 70 miles in 2.5 hours. How much faster, in miles per hours, must he travel to make the same trip in 0.75 hours less time?
উত্তর
12
২২৪৭৮
If w= 4x, 12y=8x , 6y=2z and 9v=6z then what is the value of 'w' in terms of 'V'?
উত্তর
w=3v
সমাধান
Here, 6z = 9v
or, z = 9v / 6 = 3v/2
Again, 6y = 2z
Again, 8x = 12y
or, 4x = 6y = 2z = 2 x 3v/2 = 3v
So, w = 4x = 3v
২২৪৭৯
A man runs x miles in m minutes. What is his rate of run in miles per hour?
উত্তর
60x/m
সমাধান
Time = m/60 hour
Rate of run = distance / time = x / (m/60) = 60x/m miles per hour
২২৪৮০
In a school 80% students passed in Bangla and 65% passed in Science. If 50% of the students have passed both the subjects, what percent of the students have failed in both Bangla and Science?
উত্তর
5%
সমাধান
Students passed in atleast one subject = 80% + 65% - 50% = 95%
Students failed in both subjects = 100% - 95% = 5%