Maths & Physics Help

[sweetsh]

Dont worry

[Zain-Xa]

i have another doubt.........

A student played a computer game 500 times and won 370 of these games.
he then won the next "x" games and lost none.
he has now won 75% of the games he has played.
Find the value of "x"

(pls show hw u got ur answer)

[zara]

its vry simple.....u do it like this...
total games played=500+x
games won=370+x
therefore,,,
370+x=(75/100)(500+x)
370+x=375+0.75x
375-370=x-0.75x
5=0.25x
x=5/0.25
x=20

chk d answer wid ms n if its rong lemme kno....
nemor doubts...plz don't hesitate

[godfather93]

ok now, the total number of games he's played is 500 + x.
the number of games he's won is 370 + x
The number of games he has won is 75% of (500 + x). (cause it says that he won 75% of the total games played)
hence, 370 + x = 75/100 * (500 + x)
          370 + x = 375 + 0.75 x
          0.25x = 5
          x = 20

[godfather93]

guess we posted at the same time! lol

[zara]

yea......hehe

[zara]

actually urs is 3 mins late...lol

[Zain-Xa]

thanx both of u   

[Zain-Xa]

My last Q for now 

a straight line passes through 2 points with co-ordinates (6,8) and (0,5).
Equation of the line?

[astarmathsandphysics]

My last Q for now 

a straight line passes through 2 points with co-ordinates (6,8) and (0,5).
Equation of the line?

gadient m=(y₂-y₁)/(x₂-x₁)=(5-8)/(0-6)=1/2

y-y₁=m(x-x₁)
y-8=1/2(x-6) so y=1/2x+5

[godfather93]

use the formula for the gradient: (y2 -y1)/(x2 - x1)
so it's (8 - 5)/(6-0)= 1/2
the y intercept is 5 because of the coordinate (0,5)
equation of line = y= 1/2x + 5

[godfather93]

i agree you were quicker both times, but you got it wrong on this one. the gradient is a 1/2, not -1/2.

[astarmathsandphysics]

I am a learner with latex that is why I sometimes get it wrong

[godfather93]

sorry, i thought u were zara....

[Zain-Xa]

thanx so is 1/2 or -1/2