২২৩২১
Novera bought a ticket of a cricket match for TK. 25 and later sold the ticket to Nahid for TK. 75. What was the percent increase in the price of the ticket?
উত্তর
200%
সমাধান
Profit = (0.75 - 0.25) / 0.25 x 100% = 0.5 / 0.25 x 100% = 200%
২২৩২২
A digital 12 hour clock falls behind 10 minutes each day. How many days will it take to reach a point where the clock will indicate the correct time?
উত্তর
72
সমাধান
it falls behind 10 mins each day
so to show correct time it should lose 12 hours(720 mins) if it has only 12 hour divisions
no. of days = 720/10 = 72
so in 72 days it would lose 720 mins or 12 hours
after 72 days it would show the time correctly.
২২৩২৩
The diameter of a wheel is 63 cm. Distance traveled by the wheel in 100 revolutions is ----
উত্তর
198 meters
সমাধান
Radius of the wheel, R = 63/2 cm = 31.5 cm
Distance travelled in one revolution = 2 π R = 2 π x (31.5) = 63 π cm = 0.63 π meters
So, distance travelled in 100 revolutions = 100 x 0.63 π = 63 x 3.1416 = 198 meters
২২৩২৪
If the product of three consecutive integers is 210, then the sum of the two smaller integers is -
উত্তর
11
সমাধান
Here, 210 = 2 x 3 x 5 x 7
Product of three consecutive integers 5, 6 & 7 = 5 x 6 x 7 = 210.
So, the sum of the first two integers = 5 + 6 = 11
২২৩২৫
১, ২, ৪, ৮ এ ধারাটির পরের সংখ্যা কত?
উত্তর
16
সমাধান
১ম পদ = 20 = 1২য় পদ = 21 = 2
৩য় পদ = 22 = 4৪র্থ পদ = 23 = 8
৫ম পদ = 24 = 16.(ans)
২২৩২৬
The simple interest on a certain sum of money at 4 percent per annum for 4 years is Tk. 87.5 more than interest on the same sum for 3 years at 5 percent per annum. Find the sum of money.
উত্তর
Tk. 8,750
২২৩২৮
How many numbers from 11 to 50 are there which are exactly divisible by 7 but not by 3?
উত্তর
6
সমাধান
The numbers are 14,28,35,49 Whice are divisible by but not by 3
২২৩২৯
১+২+৩+.........+১০০=কত?
উত্তর
5050
সমাধান
ধারার সমষ্টি = [n(n + ১)/২]
= [১০০(১০০ + ১)/২]
= [১০০(১০০ + ১)/২] = ৫০৫০
উত্তরঃ ৫০৫০
২২৩৩০
A florist has 200 roses and 180 jasmines with him. He was asked to make garlands of flowers. Which of the following numbers of flower will join together without leaving a single flower?
উত্তর
20