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Answer

Cup + 20M = 0.7kg = 700g

Cup + 10N = 280g

M = 2N

20M = 40N

 

So, if:

Cup + 40N = 700g

Cup + 10N = 280g

30N = 700g – 280g

= 420g

N = 14g (mass of each nail)

Cup –> 280 – (10 × 14) = 280 – 140

= 140g

0 Replies 2 Likes ✔Accepted Answer
The worksheets says "Draw a Model". So here goes:

Let n be the mass of a nail. So the marble is 2n. From the diagram,
we see that we can pair a marble (2n) with 2 nails (n + n).

So the 15 marbles above is 15 x 2n = 30n. That is the difference in mass
given by 700-280 = 420. So n = 420/30 = 14.

Mass of cup is 280 - 10n = 280 - 140 = 140 g.
0 Replies 1 Like