২২৮৩১
Alam weighs twice as much as much as Marina. Marina's weight is 60% of Robin's weight. Drabir weight 50% of Lima's weight. Lima weight 190% of Alam's weight. Which of these 5 people weight the least?
উত্তর
Marina
২২৮৩২
Taxi fare is charged at Tk. 15 per mile plus Tk. 150 for a trip. If the total fare by taxi is Tk. 600. then what is the distance covered in miles by the trip?
উত্তর
30
সমাধান
600 - 150 = Tk.450
Distance = 450/15 = 30 mile
২২৮৩৩
If 4x is 9 greater than the sum of x and 3y, then x is how much greater than y?
উত্তর
9
সমাধান
Here, 4x = x + 3y + 9
or, 4x - x - 3y = 9
or, 3x - 3y = 9
or, 3(x - y) = 9
or, (x - y) = 9/3 = 3
So, x is 3 greater than y.
২২৮৩৪
A picnic was attended by 240 persons. There were 20 more men than women and 20 more adults than children.How , many men were there in the picnic?
উত্তর
130
সমাধান
Let, Number of women x
so, Number of men = x + 20
so, x + x + 20 = 240
বা, 2x = 220
বা, x = 110
Number of women 110
and Number of men = 110 + 20 = 130
২২৮৩৫
If 8 men can do a job in 12 days, what is the percentage change in the number of days required to do the job if 2 men are released?
উত্তর
33.33%
সমাধান
Remaining men = 8 - 2 = 6
8 men can do the job in 12 days
So, 6 men can do te job in 12×8/6 = 16 days
Increase percentage in number of days = (16 - 12) / 12 × 100% = 33.33%
২২৮৩৬
A train went 300 miles from City X to City Y at an average speed of 80 mph. At what speed did it travel on the way back if its average speed for the whole trip was 100 mph?
উত্তর
133.33 mph
সমাধান
Average speed for same distance is given by (2×v1×v2)/(v1+v2)So, (2×80×v2)/80+v2=100160×v2=8000+100×v260×v2=80003×v2=400v2=400/3 =133.33 Ans : 133.33 mph
২২৮৩৭
If nis any integer, which of the following is always an odd integer?
উত্তর
2n+1
সমাধান
If, n is an integer then 2n is always even integer.
so, (2n + 1) is always an odd number.
২২৮৩৮
A watch was sold at 15% loss. If the selling price was Tk 8 more , then the seller could have made a profit of 10% what was the purchase price of that watch?
উত্তর
32
সমাধান
Shortcut method
Purchase price or cost = (100×more) / 1st% u 2nd% = (100×8) / ( 15 + 10) = 800/25 = 32
২২৮৩৯
what past of an hour elapses between 11:40 a. m. and 12: 20 p.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
২২৮৪০
If X is an odd integer and Y is an even integer, which of the following statements is (are) always true? 1. X+Y is odd 2. XY is odd 3. 2X+Y is even
উত্তর
1 only
সমাধান
1. Addition of odd and even integers yields odd intgers. Example: 4 + 3 = 7. So, statement 1 is true.
2. Multiplication of odd and even integers yields even integers. Example: 4x3 = 12. So, statement 2 is false.
3. 2x is even and y is also even. So, 2x + y is even. Therefore, statement 3 is true.