3 years ago

Solve this linear equation 2(x-5)-5(7-x)=9

Mathematics

1 answer:

Rasek [7]3 years ago

3 0

Distribute.

2x-10-35+5x=9

Combine like terms.

7x-45=9

Add 45 to both sides.

7x=54

x= 7.7

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In a group of 48 children there are twice as many boys as girls how many girls are they

Alexeev081 [22]

Let x = the number of boys.
Let y = the number of girls.

There are 48 children, therefore
x + y = 48 (1)

There are twice as many boys as girls, therefore
x = 2y (2)

Substitute (2) into (1).
2y + y = 48
3y = 48
y = 48/3 = 16
x = 2y = 2*16 = 32

x=32, y = 16

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