২২৭৮১
the average age of 12 children is 20 years. If the age of one more child is added, the average decreased by 1. What is the age of child added later?
উত্তর
7
সমাধান
Average of 12 is 20
Total = 12 × 20 = 240
Let the age of one more is x
So, total 240 + x
Average of 13 is (240 + x)/13
ATQ
(240 + x)/13 = 19
or, 240 + x = 13 × 19
or, 240 + x = 247
∴ x = 7 (ans)
২২৭৮২
The length of a rectangle is 3 times of its width. If the width of the rectangle is 5 inches, what is the rectangle's area, in square inches?
উত্তর
75
সমাধান
Given Width of the rectangle = 5 inches
So length = 3 × 5 = 15 inches
Area of a rectangle is = 5 × 15 = 75 sq. Inch (ans)
২২৭৮৩
If P is the center of the given circle, what fraction of the circle is shaded?
উত্তর
1/6
২২৭৮৪
ABCD is a square, EFGH is a rectangle, AB=3, EF=4, FG=6. Determine the area of the region outside of ABCD and inside of EFGH.
উত্তর
15
২২৭৮৬
After x years Sujan will be y years old. After z years Sujan will be---
উত্তর
y-x+z
সমাধান
Present age of Sujan = y - x yearsAfter z years Sujan will be y - x + z years old
২২৭৮৭
A bakery opened yesterday with its daily supply of 40 dozen rolls. Half of the rolls were sold by noon, and 80% of the remaining rolls were sold between noon and closing time. How many dozen rolls had been sold when the bakery closed yesterday?
উত্তর
4 dozen
২২৭৮৮
A 40 feet long rope is cut into two pieces. If one piece is longer than the other by 18 feet, what is the length, in feet, of the shorter piece?
উত্তর
11 feet
সমাধান
Let, length of one piece be x. Then, another pieces lengh = x + 10Shorter piece = x + x + 10 = 402x = 22x = 11
২২৭৮৯
2 bats and 2 balls cost Tk. 300. 5 bats and 5 balls cost Tk. 750.3 balls and 3 bats cost ----
উত্তর
Tk. 450
২২৭৯০
The sum of 5 consecutive integers is 105. The sum of the first 2 is -----
উত্তর
39
সমাধান
x + (x - 1) + (x + 2) + (x + 3) + (x + 4) = 1055x + 10 = 1055x = 95x = 19x + (x - 1)19 + 20 = 39