3 years ago

5

Mathematics

1 answer:

natima [27]3 years ago

6 0

a) What is the ratio girls to boys in the class?

Answer: 2 : 1

b) What is the ratio boys to girls in the class?

Answer: 1 : 2

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SVETLANKA909090 [29]

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4 years ago

Y varies directly as x if y = 3 when x = 12 find y when x = 20

natima [27]

Y = kx, k being a constant

--------------------------------------
Find k :
--------------------------------------
When x = 12, y = 3
3 = k(12)
k = 3/12
k = 1/4

Equation : y = 1/4 x

--------------------------------------
Find y when x = 20:
--------------------------------------
When x = 20,
y = 1/4 (20)
y = 5

--------------------------------------
Answer: y = 5
--------------------------------------

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Nataly_w [17]

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