Answer:
Explanation:
Emily buys 3 pencils for 51p
Work out the price of 4 pencils.
51 : 3 * 4 = 68p
68
We can write a ratio to solve
3 pencils 4 pencils
------------- = -------------
51 p x
Using cross products
3x = 51*4
3x = 204
Divide by 3
3x/3 = 204/3
x = 68
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