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todd2000

macrumors 68000
Original poster
Nov 14, 2005
1,632
34
Danville, VA
If a block weighs eight kilograms plus half a block, what is the weight of a block and a half?

I'll chime in after a few answers...

Explain your answer please...
 
If a block weighs eight kilograms plus half a block, what is the weight of a block and a half?

I'll chime in after a few answers...

Explain your answer please...

if it weighs 8kilo + 1/2 a block (4kilos) = 12 kilos for 1 block. so a block and a half would weigh 18kilos.

Now, if the word play is to lock in the weight of a block at 8 kilos, then your 1.5 blocks would be 12kilos.

I'm pretty tired, so if I amusingly punted this one, enlighten (ridicule :D ) me.
 
1 block weighs 8kg + half a block
half a block weighs 8kg
1 block weighs 16kg
hence, 1 and a half blocks weighs 16+16/2 = 24kg
 
1 block weighs 8kg + half a block
half a block weighs 8kg
1 block weighs 16kg
hence, 1 and a half blocks weighs 16+16/2 = 24kg

It says the answer is 24, but I'm still stuck at 18...

If 1 block weighs 8kg + half a block, then how can 1/2 a block weight 8kg?

It should be 8kg+4kg = 12kg

1/2 of 12kg = 6kg + 12kg(one block) = 18kg
 
ok, suppose a block weighs x kg

Then x = 8 + 0.5 x meaning that 0.5 x = 8 meaning x = 16


The question says, how much does 1.5 blocks weigh,

well 1.5*x = 1.5 * 16 = 24
 
ok, suppose a block weighs x kg

Then x = 8 + 0.5 x meaning that 0.5 x = 8 meaning x = 16


The question says, how much does 1.5 blocks weigh,

well 1.5*x = 1.5 * 16 = 24

ah, quite simple if you use your head. For those like me who locked into the 8kg as a finite weight, think of it like this:
A block weighs 1/2 a block + 8kg. That makes it easier for me to solve. Your mileage may vary...
 
1 block = 1/2 block + 8kg
subtract 1/2 block from both sides
1/2 block = 8kg
multiply both sides by 2
1 block = 16kg

You need to find the weight of 1-1/2 block.

1block * (1.5) = 16kg * (1.5)
1.5 blocks = 24kg
 
It says the answer is 24, but I'm still stuck at 18...

If 1 block weighs 8kg + half a block, then how can 1/2 a block weight 8kg?

It should be 8kg+4kg = 12kg

1/2 of 12kg = 6kg + 12kg(one block) = 18kg
This might be easier for you to visualize,
Code:
1 block = 1/2 block + 1/2 block
1 block =    8kg    + 1/2 block

Hence,
1/2 block = 8kg,
and 1 block = 8x2 = 16 kg
 
Last edited:
Should be Y=1.5X so Y=1.5 * total weight(16) = 24. Reminds me of the SAT's
The key to killing the math part is making every problem like this into a simple formula to solve. Don't get stuck in the semantics of the questions or you will get them wrong.
 
the word play is to get you to lock into the number eight. So you hear 8+half and you think 12, then you add half that and get 18. The idea is to get you to actually use formulas and do the math instead of just going off the only visible number which is 8. The actual math, as the formulas have shown equals out to 24.
 
1 block = 1/2 block + 8kg
subtract 1/2 block from both sides
1/2 block = 8kg
multiply both sides by 2
1 block = 16kg

You need to find the weight of 1-1/2 block.

1block * (1.5) = 16kg * (1.5)
1.5 blocks = 24kg

Ah ha! This finally made me understand what on earth people here were saying.
 
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