Veto q&a 7 Month22 (1)

2018
May
• Gain %
Gain × 100
=
Cost Price
•
100 + Gain% Selling Price =
x Cost Price
100
•
100
Cost Price = =
x selling price
100 + Gain%
• Loss = Cost Price - Selling Price
Loss × 100
• Loss % = =
Cost Price
−
• Selling Price = 100 Loss % x Cost Price
100
100
• Cost Price =
x Selling Price
100 − Loss%
WoRK anD Time
• If A can do a piece of work in ‘n’ days, then A’s
1
one day’s work =
n
• If A can do a piece of work in ‘a’ days and B can
do the same work in ‘b’ days, then both A and B
ab
together can finish the work in days
a+
b
• If A and B can together finish a job in ‘a’ days and
B alone can finish the same job in ‘b’ days, then,
ab
A alone can finish the job in days
a−
b
• If A can finish a work in ‘a’ days, B can finish
it in ‘b’ days and C can finish it in ‘c’ days
then A, B & C together can finish the work
abc
i n
days
ab + bc + ac
• If A men or B women can finish a work in C days,
then ‘a’men and ‘b’ women can finish the same
ABC
work in days
Ab + Ba
PiPeS anD ciSTeRn
• Pipe A can fill the tank in ‘a’ hours where as pipe
B can fill the tank in ‘b’ hours, if both the pipes
ab
are opened together the tank will be filled
in hours
a+
b
• Pipe A can fill the tank in ‘a’ hours where as pipe
B can empty the tank in ‘b’ hours, if both the pipes
ab
are opened together, the tank will be filled
a−
b
in hours
SPeeD, DiSTance anD Time
Dis tance
• Speed =
Time
• If A and B covers equal distance at different
speeds ‘a km/hr’ and ‘b km/hr’ respectively. Then
2ab
the Average Speed =
a + b
⎛ ⎞
• x km/hr = ⎜ × ⎟m/sec
⎝ 18 ⎠
⎛ 18 ⎞
• x m/sec = ⎜x
× ⎟ km/hr
⎝ 5 ⎠
RelaTiVe SPeeD
• If two bodies moves in the same direction with
speeds S1 and S2 then Relative Speed = S1 - S2
• If two bodies moves in the opposite direction with
speeds S1 and S2 then Relative Speed = S1+ S2
TRain
• If two trains of lengths L1 and L2 are moving in
opposite directions at speeds S1 and S2, then the
time taken by the trains to cross each other
L1+
L2
=
S1+
S2
• If two trains of lengths L1 and L2 are moving in
same direction at speeds S1 and S2, then the
time taken by the faster train to cross the slower
L1+
L2
train =
S − S
1 2
BoaTS anD STReamS
@hang out
• In water, the direction along the stream is called
down stream and the direction against the
stream is called upstream
• If the speed of a boat in still water is ‘a km/hr’ and
the speed of the stream is ‘b km/hr’, then
56 Q&AUbdn current affairs & gk
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