Question

if 150 empty bottles weight 4.5 how much will 90 empty bottles weight

Answer 1

put it in a ratio\[\frac{ 150 }{4.5 }=\frac{ 90 }{ x }\]

Answer 2

And now cross multiply...

Answer 3

Just put it in a proportion and solve.

Answer 4

cross multiply what numbers

Answer 5

\[4.5\div150=0.03\times90=2.7\] So 90 empty bottles weigh 2.7.

Answer 6

who puts the x in the denominator?!

Answer 7

\[150x=90\times4.5\]

Answer 8

That's how I always solve it. I rarely cross multiply.

Answer 9

\[x=\frac{ 90\times4.5 }{ 150 }\]

Answer 10

I just used ratios.

Answer 11

150:4.5 1:0.03 90:2.7

Answer 12

that equals 3.8

Answer 13

Basicly, find out how much one empty water bottle weighs, then take that ammount times 90.

Answer 14

So one bottle weighs 0.03, so\[0.03\times90\]

Answer 15

So the answer is 2.7

Answer 16

oh i see okay

Answer 17

It's much simplier than cross multiplying.

Answer 18

I agree.

Answer 19

Everyone has their own way of thinking.