9×1=9

9×13=117

117×1=117

117×2=234

234×15=3510

3510×25=87750

Check:

9×13×2×15×25=87750

100%-40%-50%=10%

10%->$200

100%->$200×10=$2000

Ans: $2000

Hello MaiaMitchell,

Alex' salary =  x

40% of x = 0.4 x     =>    to his parents

he spend  50% of x =  0.5 x

x-0.4x-0.5x=200       =>    0.1x = 200      =>    x= 2000

The salary  =  2000    [ $ ]

To his parents  2000*40% = 800     [ $ ]

Alex spend  2000* 50% = 1000    [ $ ]

I hope this is right!

Gruß radix !

Thanks Chris,  you are right, this question can be tackled very easily your way :)

This is a fairly simple example and it can be worked out just as CPhill says and it is easier that way too. :)

4/5x-1/5x=9

(4x)/5-(1x)/5=9

(3x)/5=9

3x=45

x=15

sine a = 0,0034296

a = inverse sin 0.0034299     OR  A=asin 0.0034296

$$\underset{\,\,\,\,^{\textcolor[rgb]{0.66,0.66,0.66}{360^\circ}}}{{sin}}^{\!\!\mathtt{-1}}{\left({\mathtt{0.003\: \!429\: \!6}}\right)} = {\mathtt{0.196\: \!501\: \!990\: \!634^{\circ}}}$$

That is a very tiny angle !   :)

GO MELODY!

Yes TR but if we could not torture you and the others of your generation , where would the fun be in life ???

Thanks Chris,   

I can never remember this.

The plot thickens....!!!!!

I'm not among the best.....but...I do have my moments.....!!!!

24(9 + 3)  = 24(12) = 288

Feel better, now????

25% of the books in a library are Malay books. The rest are Tamil, Chinese and English books in the ratio of 9:2:4. There are 480 more tamil books than Malay books. How many books are there in the library altogether?

25% are Malay and 75%  are the rest...of these  (9/15)75%  =  45% are Tamil

Let T be the total...and we know that

.45T  = .25T + 480     subtract  .25T from both sides

.20T  = 480      divide both sides by .20

T = 480/.20   =   2400 total books

Check

2400(.45 - .25)  =  2400(.20)  = 480

The first answer is wrong

37% are adults...then, 63% aren't.....and the  girl/boy ratio is 3:4.....so 27% are girls and 36% are boys....and we know that.....

.37T  = .27T + 80   where T is the total number of people     subtract .27T from both sides....

.10T  = 80     divide both sides by .10

T   = 800 total people

Check

37% of 800  = 296

27%  of 800  = 216

And (296 - 216)  = 80

The nth term is given by......

[ Phiⁿ - (-phiⁿ )] / √5        where  Phi =  [1 + √5]/ 2  ....   and phi  is the reciprocal of this

BTW....this is known as "Binet's" Formula

Surprisingly enough....the irrational number in the denominator might lead you to believe that this "formula" would produce an irrational result....but it doesn't.....!!!!

WE FORGOT             

64% of the fruits at a stall are oranges. The rest are apples and pears in the ratio 4:5. There are 880 more oranges than pears. How many fruits are there at the stall altogether?

This is similar to the other problem.....the apples and pears comprise the other 36%...and if they're in the ratio of 4:5  .....  there must be  16% apples and 20% pears.....

Again, let T be the total....and we know that

.64T = .20T + 880    subtract .20T   from both sides

.44T  = 880      divide both sides by .44

T = 880/.44  = 2000 total fruits

Check  .....there are .64 x 2000 = 1280 oranges

And there are .20  x 2000 = 400  pears

And (1280 - 400)  = 880

20% of the spectators in a match are women. 10% are girls, 30% are boys and the remaining 3600 spectators are men. Find the total number of spectators at the match?

(20 +  10 + 30)%  =  60% are not men....so 40% are.....and there are 3600 men....so....

Let T be the total number of spectators

And we have.....

.40T = 3600   divide both sides by ,40

T = 3600/.40  = 9000  = the total number of spectators

Something you eat🎑🍡🍳🍞🍩🍮🍎🍏🍦🍨🍊🍋🍧🎂🍒🍇🍰🍪🍉🌽🍅🍓🍆🍠🍑🍍🍐🍈🍌🍫🍬🍯🍡🍛🍻🏆🍤🍱🍣🍥🍙🍕🍘🍔☕️🍵🍟🍚🍜🍗🍶🍼🍖🍲🍢🍝🍺

51% of the fish in a pond are swordtails. The rest are mollies and guppies in the ratio 5:2. There are 222 more swordtails than guppies. How many fish are there in the pond altogether?(please help me with this within 5 minutes)

Thr mollies and guppies comprise the other 49% of the fish.....if they are in the ratio of 5:2, then 35% of the total are mollies and 14% are guppies.

Let T be the total number of fish.  Then.........

51% T   =  14%T + 222      or

.51T = .14T + 222     subtract .14T from both sides

.37T = 222   divide both sides by ,37

T = 222/.37 = 600 fish total

Check .....    51% are swordtails = 306

14% are guppies = 84

And 306 - 84 = 222

Is Mrs Nauseated pregnant?    Congratulations !

The name you have inflicted upon her will suit her well for a while :/

typical moms, eh? yea i know how this adult generation works, always complaining about how this teenage generation is so lazy and we spend too much time on the internet
only teens can understand other teens, so we feel you everytime anyone from this adult generation or the elderly torutre you

(19 + 23 + 28)%   = 70%  of the fruits are something other than mangoes.

Then, mangoes must comprise the other 30%.......let N be the total numer of fruits....so.....

180  = 30%  of N    .....  or   ......

180  = .30N      divide both sides by  .30

180/.30 = N   = 600 total fruits