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k0ka [10]
2 years ago
13

How many kilograms of coffee worth 40/kg must be mixed with coffee worth $11/kg to give 12kg of coffee worth $9.50/kg

Mathematics
1 answer:
Kazeer [188]2 years ago
4 0

Answer:

0.62kg

Step-by-step explanation:

Let

x = 40/kg coffee

y = 11/kg coffee

two equations can be derived from the question

x + y = 12 equation 1

40x + 11y = 114 (9.5 x 12)  equation 2

multiply equation 1 by 11

11x + 11y = 132 equation 3

subtract eqn 3 from eqn 2

29x = 18

divide both sides of the equation by 29

x = 0.62kg

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Which equation relates the number of triangles in the figure (n) to the perimeter of the figure (p)
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Answer:

Option d is correct.

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Explanation;

Given the perimeter of each figure is;

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Let n be the number of figure and P be the perimeter of the figure;

the only equation which satisfy the given perimeter is;

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Check:

for n =1 which means 1 triangle then;

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and for n =3 [i.e, 3 triangles]

P =7n+20 = 7 \cdot 3 +20 = 21+20 = 41

Therefore, the equation P =7n+20 relates the number of triangles in the figure(n) to the perimeter of the figure(P).


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