Felix is now six times as old as Debbie. In twelve years time Felix will be two times as old as Debbie. How old are they

Mathematics

1 answer:

Minchanka [31]3 years ago

6 0

Step-by-step explanation:

let debbie be x years

let felix be 6x years

in 12 years felix will be 2x older than debbie

do the calc

You might be interested in

The point (-1,-4) is on the line given by which equation below ?

Vlad1618 [11]

Answer:

D. y = 4x

Step-by-step explanation:

y = 4x

Plug in The point (-1,-4) into the equation

when x = -1, y = 4(-1) = -4

So (-1,-4) is the solution of y = 4x

4 0

3 years ago

Read 2 more answers

Kaitlin buys 9/10 of a pound of orange slices. She eats 1/3 of them and divides the rest equally into 3 bags. How much is in eac

frozen [14]

I found how to solve this by pretending the /10 wasn't there and divided 9/3= 3. Next, I subtracted 9-3=6, and because she is splitting 6 into 3 bags she will have to divide 6/3= 2. So in each bag there will be 2/10 pound of orange slices.

6 0

3 years ago

A chemical company makes two brands of antifreeze. The first brand is 65% pure antifreeze, and the second brand is 90% pure anti

Brums [2.3K]

$\bf \begin{array}{lcccl} &\stackrel{solution}{gallons}&\stackrel{\textit{\% of }}{antifreeze}&\stackrel{\textit{gallons of }}{antifreeze}\\ \cline{2-4}&\\ \textit{1st brand}&x&0.65&0.65x\\ \textit{2nd brand}&y&0.90&0.9y\\ \cline{2-4}&\\ mixture&40&0.8&32 \end{array}~\hfill \to \begin{cases} x+y&=40\\ \boxed{x}=40-y\\ \cline{1-2} 0.65x+0.9y&=32 \end{cases} \\\\[-0.35em] ~\dotfill$

$\bf \stackrel{\textit{substituting in the 2nd equation}}{0.65\left( \boxed{40-y} \right)+0.9y=32}\implies 26-0.65y+0.9y=32 \\\\\\ 26+0.25y=32\implies 0.25y=6\implies y=\cfrac{6}{0.25}\implies \blacktriangleright y=24 \blacktriangleleft \\\\[-0.35em] ~\dotfill\\\\ \stackrel{\textit{since we know that}}{x=40-y\implies }x=40-24\implies \blacktriangleright x=16 \blacktriangleleft$