Math Destroyer Test 7 q # 11

[ForeverKhaled]

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we are told that 1 dollar = 7 drachmas and that 5 drachmas = 3 qulos. we are then asked to find the ratio of dollars to quilos.

The book says the answer is 21/5 ...
but isn't it 5/21?😕

 

[read001]

(1Dollar) (7 drachmas/1Dollar) (3 qulos/ 5Drachmas) = 21/5 Qulos

Every thing else cancel out.

 

[mh0000]

we are told that 1 dollar = 7 drachmas and that 5 drachmas = 3 qulos. we are then asked to find the ratio of dollars to quilos.

The book says the answer is 21/5 ...
but isn't it 5/21?😕

($1 /7 D)(5 D/3 Q) = $5/21 Q

So I would agree with you

 

[FROGGBUSTER]

i would say 5/21 as well

 

[egan]

The question is confusingly worded. Techincally I think you could both be right depending on how you interpret it. 5/21 Dollar = 1 qulo or 1 dollar = 21/5 qulos.

I guess it just depends on how you set up the ratio.

 

[toothhornet88]

we are told that 1 dollar = 7 drachmas and that 5 drachmas = 3 qulos. we are then asked to find the ratio of dollars to quilos.

The book says the answer is 21/5 ...
but isn't it 5/21?😕

No the answer is 21/5. Here look at how i solved it:

(1) 1$= 7 D
(2) 5 D= 3Q

So to set an equation where ($=Q) you set the second equation in terms of D:
D=3/5Q and you plug it into the first equation for D:

1$= 7(3/5Q) = (7x3)/5 = 21/5

1 dollar =21/5 quilos

 

[toothhornet88]

and if the question asked what the ratio of Q to $ then the answer would be 5/21

 

[Dusk]

No the answer is 21/5. Here look at how i solved it:

(1) 1$= 7 D
(2) 5 D= 3Q

So to set an equation where ($=Q) you set the second equation in terms of D:
D=3/5Q and you plug it into the first equation for D:

1$= 7(3/5Q) = (7x3)/5 = 21/5

1 dollar =21/5 quilos

Sorry to bump this, but if 1 dollar = 21/5 quilos, and the question asks for the ratio of dollars to quillos, wouldn't you do:

1 dollars/(21/5 quillos) = 5/21 dollars to quillos.

Isn't that what they're asking? the ratio?

 

[dentist_dude]

@orgoman22 I'm confused with this question as well. It's question number 11 test 7 also in the 2015 math destroyer.
I got 5/21

 

[dentist_dude]

View attachment 203950

I think this is a different question!

 

[DAT Destroyer]

I think this is a different question!

Sorry about that!

 

[dentist_dude]

Sorry about that!View attachment 203953

Thank you!