২১৯৯১
An item is sold for $65.00 giving the retailer a profit of 30% of the cost. What will be the new retail price if the retailer cuts his profit to 10% of costs?
উত্তর
$55
সমাধান
when sp 130 then cp 100
when sp 1 then cp. 100/130
When Sp 65 then cp 100*65/130
So Cp = 50
Therefore the new retail price = 50 + 50*10% = $55
ans:$55
২১৯৯২
A train passes city X at 9.55 am and Y city at 10.15 am. The distance between cities X and Y is 45 miles. What is the average speed, in miles per hour of the train?
উত্তর
135
সমাধান
9:55 am to 10:15 am = 20 minutes = 1/3 hour
Average speed = 45 / (1/3) = 135 miles per hour
২১৯৯৩
How many tiles each of 1 square foot are necessary to form a 1 foot border around the inside of a 24 feet by 14 feet room?
উত্তর
72
সমাধান
Area of the total room = 24 x 14 = 336 sq ft
Measurements of the room without the border will be (24 - 1x2) = 22 ft by (14 - 1x2) = 12 ft.
Therefore, Area of the room without the border = 22 x 12 = 264 sq ft
So, the area of the border = 336 - 264 = 72 sq ft.
Then, the number of tiles required = 72/1 = 72.
২১৯৯৪
What part of an hour elapses between 11:40 p.m. and 12:20 a.m.?
উত্তর
2/3
সমাধান
11:40am to 12:20pm = 20min + 20 min = 40 min
Part of an hour elapse = 40min /60 min = 2/3
২১৯৯৫
If A and B are positive and A>B, which of the following is true?
উত্তর
-B/A>-A/B
সমাধান
30/75*100 = 40%
২১৯৯৬
The average of four consecutive odd positive integers is always?
উত্তর
an even number
সমাধান
1 + 3 + 5 + 7 = 16
average = 16/4 = 4
even number
২১৯৯৭
Describe the following sequence in mathematical terms: 144, 72, 36, 18, 9
উত্তর
Descending geometric sequence
সমাধান
geometric sequence means multiplying or dividing by same value, here it is seen that gradually divided by 2. so it is geometric sequence .
২১৯৯৮
If an egg takes 3 minutes to boil , how much time will it take to boil 6 eggs together?
উত্তর
3 minutes
সমাধান
It's more like a mental ability question. If you boil at the same time it would take 3 minutes still! The number of eggs is irrelevant.
২১৯৯৯
In a group of 15 high school students, 7 study Latin, 8 study French and 3 study neither Latin nor French. How many students study both Latin and French?
উত্তর
6
সমাধান
The number of students studying Latin or French n(LUF) = 15 - 3 = 12
Now, n(LUF) = n(L) + n(F) - n(LꓵF)
or, n(LꓵF) = n(L) + n(F) - n(LUF) = 7 + 8 - 12 = 3
২২০০০
P is the father of Q but Q is not the son of P. What is the relationship between Q and P?
উত্তর
Father and daughter
সমাধান
If not son, then obviously Q is P's daughter. So the relationship between P and Q is Father and Daughter.