Maths questions

[Killa_ken]

Q) Marbles are to be removed from a jar that contains 12red marbles and 12 black marbles. What is the leastnumber of marbles that could be removed sothat theratio of red marbles to black marbles left in the jar willbe 4 to 3 ?

Q)For what positive number is the square root of the
number the same as the number divided by 40 ?

Q) If 0≤ x≤ y and ax+yf −ax−yf ≥2 2 25,

whatis the least possible value of y ?

blimey

 

[Andr3w]

My head hurts now,thanks

 

[Ricochet J]

Q) Marbles are to be removed from a jar that contains 12red marbles and 12 black marbles. What is the leastnumber of marbles that could be removed sothat theratio of red marbles to black marbles left in the jar willbe 4 to 3 ?

Q)For what positive number is the square root of the
number the same as the number divided by 40 ?

Q) If 0≤ x≤ y and ax+yf −ax−yf ≥2 2 25,

whatis the least possible value of y ?

blimey

I would have done these questions no problems if I was back at college doing my maths. Now, i've got 6 weeks off before I start my A2.

I miss maths

 

[Visage]

Q) If 0≤ x≤ y and ax+yf −ax−yf ≥2 2 25

Eh?

ax+yf −ax−yf is identical to zero.

 

[daz]

Q) Marbles are to be removed from a jar that contains 12red marbles and 12 black marbles. What is the leastnumber of marbles that could be removed sothat theratio of red marbles to black marbles left in the jar willbe 4 to 3 ?

3?

Q)For what positive number is the square root of the
number the same as the number divided by 40 ?

1600 (40^2)?

 

[RB506]

Is 2 not just 1600?

 

[wombleboy05]

Q) Marbles are to be removed from a jar that contains 12red marbles and 12 black marbles. What is the leastnumber of marbles that could be removed sothat theratio of red marbles to black marbles left in the jar willbe 4 to 3 ?

I'm useless at maths but is the anwser 3 marbles

 

[Buttons]

Surely the first two are easy peasy and the last is bonkers?

 

[A.N.Other]

Q) Marbles are to be removed from a jar that contains 12red marbles and 12 black marbles. What is the leastnumber of marbles that could be removed sothat theratio of red marbles to black marbles left in the jar willbe 4 to 3 ?

Unless I'm completely missing the point (which I'm not) ... that really isn't that difficult !

 

[Amleto]

Q) If 0≤ x≤ y and ax+yf −ax−yf ≥2 2 25,

whatis the least possible value of y ?

blimey

what?

2 equations in 4 unknowns. At best you will have two free variables.

edit: aside from 0>= 2225 not helping much : /

 

[alexthecheese]

I'll probably look like a spack, but is it:

1) 3

2) 40

3) err

First two cant be right as otherwise they're way too easy!

Cues up looking like a spackhead...

 

[mks2005]

question 3 makes no sense, and the first too are easy.

 

[Killa_ken]

if 0 =< X =<Y AND (x+y)^2 - (x-y)^2 >=25 what is the least possible value of Y

sorry my bad when copy and pasting

 

[daz]

if 0 =< X =<Y AND (x+y)^2 - (x-y)^2 >=25 what is the least possible value of Y

sorry my bad when copy and pasting

It comes out to xy >= 6.25

Y can be as low as 2.5 (to satisfy 0 <= x <= y) .

 

[Amleto]

if 0 =< X =<Y AND (x+y)^2 - (x-y)^2 >=25 what is the least possible value of Y

sorry my bad when copy and pasting

y>0, erm mistake somewhere...

edit: yea, 2.5 after the first inequality is taken into account