২৩১৩১
Nisha's father contributes to her savings by giving her 10% of her total savings. If Nisha saves TK.100 in June, TK.250 in July and TK.130 in August, how much will she have in savings at the end of August?
উত্তর
TK. 528
সমাধান
100*10% = 10, 250*10% = 25, 130*10% = 13,
Total = 100 + 250 + 130 + 10 + 25 + 13 = 528
২৩১৩২
Rahim sells 60% of apples he had and throws away 15% of the remainder. Next day he sells 50% of the remainder and throws away the rest. What percent (in total) of his apples does Rahim throw?
উত্তর
23%
সমাধান
Let total apple = x
At 1st day: Remaining apple = 40% of x = .4x and throwing apple = .4x *15% = .06x
At 2nd day: Remaining apple = .4x - .06x = .34x and throwing apple = .34x *50% = .17x
So total throwing apple = .06x + .17x = .23 x, that menas 23% of total
২৩১৩৩
On Sunday, the price of a share was TK.560. If the price of the share was TK.630 at the closing of the day, what was the percent increase in the price of the share for the day?
উত্তর
12.5%
সমাধান
incresed tk = 630 - 560 = 70,
so incresed % = (70/560)*100 = 12.5
২৩১৩৪
Of the 32 students in a certain class , 15 are in debating club and 20 are in music club. If 10 of the students are not in either club, how many of the students are in only one of the two clubs?
উত্তর
9
সমাধান
Out of 3210 are not in either of the clubsThus22 = 15 + 20 -bothBoth = 13Thereforeonly music = 15-13 = 2only Dance = 20 - 13 = 7Hence 7 + 2 =9
২৩১৩৫
A car rental agency charges TK.2,000 a day plus TK.10 per mile for its rental cars. What is the total cost of traveling a total of 400 miles in 4 days in a car rented from this agency?
উত্তর
TK. 12,000
২৩১৩৬
A boy got 50% of the questions on a test correct. If he had 10 questions correct out of the first 12, and 25% of the remaining questions correct, how many questions were on the test?
উত্তর
28
সমাধান
letx = number of questionsTherefore,correct answer = 50% of x10 + 1/4 (x - 12) = 0.5x10 + 0.25x - 3 = 0.5x7 = 0.5x - 0.25x7 = 0.25xx = 7 / 0.25x = 28Therefore, they are 28 questions on the test.
২৩১৩৭
What is the greater of two number whose product is 90, if sum of these two numbers exceeds their difference by 30?
উত্তর
15
সমাধান
Let the numbers be p and q . where p > q.According to the question,(p + q) – (p – q) = 30⇒ p + q – p + q = 30⇒ 2q = 30
⇒ q =
30
= 15
2
∴ pq = 900⇒ 15p = 900
⇒ p =
900/15
= 60
২৩১৩৮
At a book fair, Danesh buys three pencils that cost TK.3.25 each and a color pen that costs TK. 5. Which expression represents the amount of change 'C' , he should get when paying with a TK.20 note?
উত্তর
TK. 336
২৩১৩৯
Rashed's average on 4 tests is 80. Assuming he can earn no more than 100 on any test, what is the least he can earn on his 5th test and still have a chance for an average of 85 after seven tests?
উত্তর
75
২৩১৪০
In creasing the original price of an item by 10%, then decreasing by 20% and then again increasing the price by 10% is equivalent to
উত্তর
3.2% decrease
সমাধান
In creasing the original price of an item by 10%, then decreasing by 20% the effect of it Will be +10-20+ [10×(-20)]/100 = -12Then again increasing the price by 10% the effect will be -12+10 +[(-12)×10]/100 = -3.2So, 3.2 decrease