Veto q&a 7 Month22 (1)

2018
May
@hang out
Q
Q
Q
Volume of Cylinder
The number of sphere got =
Volume of sphere
160π 160 × 3
= = = 15
32
π
32
3
A garden is 90m long and 75m broad. A path 5m
wide is to be built outside around it. Find the area
of the path?
The area of the path = Area of ABCD - Area of
PQRS
=(100x85) - (90x75)
= 8500-6750
= 1750m 2
D
C
S
90 5
R
5
75
85
5
P 5 Q
A
100
A teacher driving her vehicle at 24 km/hr, reaches
her school 5 minutes late. If she had driven the
vehicle 25% faster on an average she would have
reached 4 minutes earlier than the scheduled time.
How far her school?
Here first speed S 1
= 24 km/hr
125
Second speed S 2
= 24x = 30 km/hr
100
S1×
S2
Required distance = (Time difference)
S1−
S2
24 × 30 9
= x = 18km
6 60
Juice is sold in an aluminium can of cylindrical
shape that measure 6 inches in height and 2
inchesin diameter. How many cubic inches of juice
are contained in a full can approximately?
22
Volume of the can = πr 2 h = x1x1x6
7
22
7
= x6 Cubic inch
132
= Cubic inch
7
Approximately required volume = 18.8 cubic inch
B
Q
Q
Q
Q
The radii of bases of a cylinder and a cone are in
the ratio 3:4. Volume of cylinder and cone are in
the ratio 9:8. Then their heights are in the ratio?
Volume of cylinder = πr 2 h 1 1
1
Volume of cone = π 2 h 2 2
3
Ratio of volume of cylinder and cone,
1
3
3× 3 2 h1
9
=
2
4 h 8
πr 2 1 h 1 : πr2 2 h 2 = 9:8
h
h
1
2
2
2
9×
4 2
= =
2
8× 3×
3 3
h 1
: h 2
= 2 : 3
A purse contains 1 rupee, 50 paise and 25 paise
coins in the ratio 7:8:9. If the total money in the
purse is 159. The number of 50 paise coins in the
purse will be?
Ratio of values of 1 rupee, 50 paise and 25 paise
7 8 9
= : : = 28 : 16 : 9
1 2 4
Sum of the ratio = 28+16+9 = 53
16
Value of 50 paise coins = 159x =48
53
Number of 50 paise coins = 48x2 = 96
In a row of students, Sherin is 12 th from the left and
Athira is 19 th from the right. If they interchange their
positions, Sherin becomes 16 th from the left. The,
what will be position of Athira from the right?
11+Sherin ....... + Athira + 18
If they interchange their position, Sherin is 16 th from
the left
ie, 11 + Athira + 3 + Sherin + 18
Athira is 23 rd from right
( )
8+ 2 = ?
(a+b) =a +2ab+b
( 8 ) + 2x 8x 2 + ( 2)
=10+2 2x2x 2
= 10 + 8 = 18
2
2 2 2
2 2
= 8+2x 2x4x 2+2
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