Question

The cost of 20 metres of a rope is 4260 . What length of this rope can be purchased for 12780.

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Answer 1

Answer:

60

Step-by-step explanation:

Metres | Rope

20 | 4260

?(y) | 12780

This is a direct proportion.

(According to the direct proportion formula, Cross Multiplication)

20×12780 = y×4260

20×12780 upon 4260 = y

(12780 goes in the table of 4260 'multiplied by 3' So 4260 will turn into 1 and 12780 will turn into 3.

So, remains 20×3. So, 20×3 is 60. i.e 20×12780 upon 4260 = 60)

y = 60

Therefore, 60 metres of this rope can be purchased for 12780.

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