Math : for smart math people!

Question

1. the smallest positive integer value of n that will make 12n exactly divisible by 56 is

a.7

b.12

h.14

j.21

k.24

2. box ""a" contains exactly four cards, numbered 3, 5 ,6 and 9 box "b" contains exactly 3 cards numbered 1,4, and 7. one card is selected at random from box "a" and one card is selected at random from box "b". what is the probability that the sum of the numbers on the two selected cards is even?

a.1/4

b.1/3

c.5/12

d.1/2

e.7/12

3/ If 1/4 1/x = 1 then x =

a.1/8

b.2/3

c.4/3

d.2

e.3

Answer 1

thats not for smart people

Answer 2

well if i tell u the answer u have to rank me best answer. lol

the

1) b. 14

u can try every # , all u have to do is multiply the # by 12 then divide the # that u get by 56, then if u got a whole #, and that is answer.

ex: 14x 12+=168

168/56=3

3 is a positive #.

2)e.7/12

u can draw a tree or u just multiply 3 by 4, the reason u time 3 by 4 because u have to know how many chioce are there.

then is 12.

now u do

3+1 =4, that is an even # the first one then

3+4=7 no that is not even

3+7=10 is even .

now 5+1=6.................

u keep do this until u try every single of the #.

then u will get 7 even # so the answer is 7/12.

3)i think the answer is not in the chioce. the answer is 1/.25.=4x.25=1.

best answer