20/20 * 1/19 = 1/19

for the first shoe, you can take any out of 20. so probability = 20/20
haven chosen the shoe, we are left with only 1 matching shoe out of the remaining 19, so probability = 1/19

hth.

a. -4
b. -2 [2 more than A]
c. -1 [3 more than A]
d. 2 [6 more than A]
e. 5 [9 more than A]

nice, so we do have a pattern ... 4 answers have a difference of a multiple of 3 except B ... 3, 6, 9 are all multiples of 3

so we can select B without solving much

a leak can empty in 8 hrs but it took 12 hrs to empty ... so it basically emptied 1.5 tank
thus, 0.5 tank was filled by inlet pipe

rate of inlet pipe = 360 ltr/hr
in 12 hrs = 360*12 lts

capacity of tank is double of what inlet pipe emptied = 360*12*2 = 8640 ltrs

whats wrong with B ... i wouldnt pick B .. but still i want to know what is wrong with it.

hi bones,
yes i made them on ms word .... its actually pretty simple ....
you just have to insert a table and that's pretty much there is to it

you need to play a little with the dimensions though

simplicity

let's try to simplify the rule ... for a moment, just forget about this rule now see the example: The swarm (of flies) was very dense. now it's clear whether to use 'was' or 'were'. there could be sentences that get complex. the number of cars that were present in the city area was increasing. now l...