Question

Michael is three times older than his sister Angela. In 1 year, Michael will be twice as old as Angela. How old are the children today?

Answer 1

Angela = x, Michael = 3x

In 1 year, Michael = 2 (x +1)

I can get this two equations only.. I guess, something is missing..

Answer 2

oh okay, thank you though :)

Answer 3

u want any more help now

Answer 4

Well I wanted to finish the question cause the other guy only gave me one part I think

Answer 5

do u want me to give it

Answer 6

yes please

Answer 7

Angela = x, Michael = 3x
In 1 year,Angela=(x+1) , Michael = 2 (x +1)
3x+1=2x+2
3x-2x=2-1
x=1 years and 3x=3 years

Answer 8

medal please

Answer 9

lol !!!!!

Answer 10

nice attempt dude !!

Answer 11

@brook_27
are u done now

Answer 12

LOL thanks! :)
wanna help me with one more? aha

Answer 13

A chemist needs 10L of 21% salt solution. The chemist has two salt solutions availible at 15% and 25% salt. Write a solve a linear system to find the volume of each solution that needs to be combined to make the mixture

Answer 14

@brook_27
anything for u and your homework

Answer 15

Thank you soo much ! <3

Answer 16

you should post new problems in a different thread

Answer 17

@brook_27
i didnt get it

Answer 18

Let M and A be the ages of Michael and Angela today.
Solve the following for M and A:\[\{M=3A,M+1=2(A+1)\}\]\[\{M=3 \text{ years},A=1 \text{ year}\} \]

Answer 19

You just need equation i guess,

15x/100 + 25 (10 - x)/100 = 10 (21)/100

15x + 25 (10 - x) = 10 (21)

Answer 20

what are u doing @Ganpat

Answer 21

got the linear equation for the salt solution.. x liter of 15 % + (10-x) liter of 25 % = to give 10 liters of 21 %

Answer 22

I think I have to convert the percentage into decimals =l but thanks !

Answer 23

@brook_27
just ask some other questions

Answer 24

percentage is nothing but ratio to 100.. so 15 percent = 15/100

Answer 25

okay. what about -> Flying into the wind, a plane take 6h to fly 3000km. On the return flight, with the same wind, the plane takes 5h to complete the trip. How fast does the plane fly without any wind, and how fast was the wind blowing?

Answer 26

Let x and y be the volume of the 15% and 25% salt solutions respectively. Solve the following equations for x and y:\[\left\{x+y=10,\frac{15}{100}x+\frac{25}{100}y=\frac{21}{100}10\right\}\]\[\{x=4 L,y=6 L\} \]

Answer 27

omg thanks !

Answer 28

r * t = d
Let s and w be the speed of the plane in still air and w be the wind speed. Solve the following for s and w:\[\{(s-w)6=3000,(s+w)5=3000\}\]\[\{s=550 \text{ km}/\text{hr},w=50 \text{ km}/\text{hr}\} \]