২০৯৫১
There are 900 students in a school. 4% of them left the school and 50% of the remaining are girls. How many girls remained in the school?
উত্তর
432
সমাধান
900 × 4/100 = 36
Remaining = 900 - 36 = 864
Girls = 864 / 2 = 432
২০৯৫২
The price of sugar increased by 10%. What % of consumption of sugar is to be reduced in order to keep the expenditure on sugar at the same level?
উত্তর
9.09
সমাধান
10% increase,
New price will be Tk.110 if old price is Tk.100
New price will be Tk. 1 if old price is tk 100/110
New price will be Tk.100 if old price is tk = (100×100)/110 = 90.91
100 - 90.91 = 9.09
২০৯৫৩
If the cost of x litters unleaded CNG priced at Tk. 1.24 per litter is equal to the cost of x+2 litters of regular CNG priced at Tk. 1.16 per litter, then the value of x is ---
উত্তর
29
সমাধান
1.24x = ( x + 2) × 1.16 = 1.16x + 2.32
0.08x = 2.32
x = 29
২০৯৫৪
Which one of the following is the largest?
উত্তর
126/250
সমাধান
Here,
1/2 = 0.5
7/15 = 0.47
49/100 = 0.49
126/250 = 0.504
1999/4000 = 0.499
0.504> 0.5 > 0.499 > 0.49 > 0.47
২০৯৫৫
If the product of 20% of 85 and 40% of 45 is divided by 4, the result would be ---
উত্তর
76.5
সমাধান
85× (20/100) × 45 ×(40/100) /4
= (17 × 18) /4
= 76.5
২০৯৫৬
The price of a loaf of bread was increased by 20%. How many loaves can be purchased now by the amount of money used to buy 300 loaves at the earlier price?
উত্তর
250
সমাধান
Let, earlier cost price of 1 loaf is Tk.x
Earlier cost price of 300 loaves is = 300x
At 20% increase , x + x × 20% = 1.2x
Now, 300x /1.2x = 250
২০৯৫৭
There were twice as many girls as boys in a class. If 30% of the girls and 45% of the boys have already handed over their reports, what percent of the students have not yet done so?
উত্তর
65
সমাধান
Let, Boys = 100
Girls = 200
200 × 30% + 100 × 45%
= 60 + 45
= 105
300 - 105 /300 × 100%
= 195 / 300 × 100%
= 65%
২০৯৫৮
If the average of 5,6,7 and w is 8,the value of w is -----
উত্তর
14
সমাধান
5 + 7 + 6 + w = 8 ×4 = 32
W = 32 - 18 = 14
২০৯৫৯
An empty swimming pool with a capacity of 5760 gallons is filled at the rate of 12 gallons per minute, how many hours would it take to fill the pool to the capacity?
উত্তর
8
সমাধান
Filled 12 gallons in 1 min
Filled 5760 gallons in = 5760 /12 min
= 5760/( 12 ×60) hours
= 8 hours
২০৯৬০
If Mamun were twice as old as he is now, he would be 40 years older than Jamal. If Jamal is 10 years younger than Mamun, how old is Mamun?
উত্তর
30
সমাধান
Ler, Jamal = x
Mamun = x + 10
2 ( x + 10) = x + 40
x = 20
Now, Mamun is ( 20 + 10) = 30