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Phantasy [73]
3 years ago
14

Ben can do 50 sit-ups in 3 minutes. At that rate, how many sit-ups can he do in 12 minutes?

Mathematics
2 answers:
Stels [109]3 years ago
5 0
Ben can do 200 sit-ups in 12 minutes.

Pepsi [2]3 years ago
3 0
The best way to do this is to set up a proportion

50     x
---- = ----
3        12

then cross multiply and divide ( 50 times 12) / 3= 200

he can do 200 situps in 12 minutes
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Let the third number be 9x where x is an integer.

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9x = 3*3*x

2*2*2*2*3*3*11*x = 7920y where y is an integer

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so x = 7920y / 1584= 5y.

Now the GCD is 12  so x must have  4 as one of its factors.

Also x is a multiple of 5 so it could be 20 then y  would be 4.

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This checks out OK.

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