Steve has 12 biscuits in a tin.
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Answer:
Step-by-step explanation:
In similar triangles, the corresponding sides are in same proportion.
Cross multiply,
4x*12 = 15*(3x + 1)
48x = 15*3x + 15*1
48x = 45x + 15
48x -45x = 15
3x = 15
x = 15/3
x = 5