Question

7 in every 9 packets of crisps in a box are salt and vinegar. The rest are plain. There are 63 packets of salt and vinegar in the box. How many packets of plain crisps are there?⭐⭐⭐⭐⭐⭐​

Answer 1

14

Explanation:

9/9 - 7/9 = 2/9

2 in every 9 packets of ceisps in a box are plain crisps.

Then:

63*2/9 = 126/9

= 14

Answer 2

If 7 in every 9 packets of crisps in a box are salt and vinegar, then 9-7 = 2 packets of crisps in a box are plain.

If there are 63 packets of salt and vinegar in the box, then 63 packets / 7 = 9 groups of 9 packets in the box.

So, 9 groups * 2 plain crisps = 18 packets of plain crisps in the box.

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