২২৯১১
If n is an even positive integer and K +2 =3n , which of the following could be a value of k?
উত্তর
25
২২৯১২
The average of 6 numbers is 8.5 , when one number is discarded the average of the remaining numbers becomes 7.2.what is the discarded number?
উত্তর
15
২২৯১৩
3.003/2.002 =?
উত্তর
1.5
সমাধান
২.০০২)৩.০০৩(১.৫
২.০০২
________________
১.০০১০
১.০০১০
___________________
০
২২৯১৪
what is the least integer that is a sum of three different primes each greater than 20?
উত্তর
83
২২৯১৫
The organizers of a fair projected a 25 percent increase in attendance this year over that of last year, but attendance this year actually decreased by 20 percent. what percent of the projected attendance was the actual attendance?
উত্তর
64%
সমাধান
Let,
last year present = 100
this year projected present = (100 + 25) = 125
this year Actual present = (100 - 20) = 80
so, the percentage = ((80/125)*100)% = 64%
২২৯১৬
If 18 is 15 percent of 30 percent of a certain number, what is the number?
উত্তর
400
সমাধান
Let, the number = x
= > x × 30% × 15% = 18
= > x = ( 18 × 100 × 100) /30×15 = 400
২২৯১৭
Maria Purchased brand X pens for Tk. 4.00 apiece and brand Y pens for Tk. 2.80 apiece. If Maria purchased a total of 12 of those pens for Tk. 42.00 ,how many brand x pens did she purchase?
উত্তর
7
সমাধান
Let, number of X brand pens that she purchased = P number of Y brand pens that she purchased = 12-Pnow, 4P + 2.80(12-P) = 424P + 33.6 - 2.80P = 421.2P = 8.4P = 7so, number of X brand pens that she purchased = 7 (Ans.)
২২৯১৮
If the population of a certain country increases at the rate of one person every 15 second, by how many persons does the population increase in 20 minutes?
উত্তর
80
সমাধান
Population increased in 15 sec = 1
Population increased in 60 sec or 1 min = 1×4 = 4
Population increased in 20 min = 4×20 = 80
২২৯১৯
The Value of -3 -(-10) is greater than the value of -10 -(-3) by
উত্তর
14
সমাধান
-3-(-10)=-3+10=7•••••••(1)And,-10-(-3)=-10+3=-7••••••(2)Now, difference between (1)and(2)=7-(-7)=7+7=14Answer:14
২২৯২০
A rectangular box is 10 inches wide, 10 inches long and 5 inches high. what is the greatest possible distance, in inches ,between any two points on the box?
উত্তর
15
সমাধান
আয়তাকার বক্সটির width (a) = 10 inch; length (b) = 10 inch এবং height (c) = 5 inch দুটি বিন্দুর মধ্যকার greatest distance (সর্বোচ্চ দূরত্ব) বা কর্ণ d - এর মান বের করতে হবে।
আমরা জানি,
ঘণবস্তুর কর্ণের দৈর্ঘ্য
(d) = ✓(a² + b² + c²)
= ✓(10² + 10² + 5²)
= ✓225
= 15