I don’t understand this question someone please help

Mathematics

1 answer:

kirill [66]3 years ago

7 0

Answer:

£152.40

Step-by-step explanation:

If he made 80 cakes at a ratio of 3:2:5, then he made:

24 chocolate cakes

16 lemon cake

40 fruit cakes

He sold all of the chocolate: 24x2=48

He sold 3/4 of the lemon: 3/4 of 16=12 12x1.70=20.40

He sold 7/8 of the fruit cakes: 7/8 of 40=35 35x2.4=84

48+20.40+84=152.40

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Consider the following pair of equations:

Aloiza [94]

Y = 3x + 3 this is equation 1
y = x -1 this is equation 2
since equation 1 and 2 already defined y in terms of x, we're just gonna substitute y into the other equation. as 2 is shorter I'm going with that today
x - 1 = 3x +3
-1 - 3 = 3x - x
-4 = 2x
x = -2
now we've got x just sub it in equation 2
y = -2 -1
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5 0

3 years ago

Solve for c.<br><br> 3 − 7c − 20c = 7(–7c − 19) + 14c<br><br> c =

Kazeer [188]

Answer:

$\boxed{c = -17}$

Step-by-step explanation:

$= > 3 - 7c - 20c = 7( - 7c - 19) + 14c \\ \\ = > 3 - 27c = ( - 7c \times 7) - (7 \times 19) + 14c \\ \\ = > 3 - 27c = - 49c - 133 + 14c \\ \\ = > 3 - 27c = - 35c - 133 \\ \\ = > 3 - 27c + 35c = - 133 \\ \\ = > 3 + 8c = - 133 \\ \\ = > 8c = - 133 - 3 \\ \\ = > 8c = - 136 \\ \\ = > c = - \frac{136}{8} \\ \\ = > c = - 17$