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X^12/x^9=125
Simplify the left side
x^3=125
Find the cube root of both sides
x=5
Final answer: The number is 5
Answer:
5:5 (first box, pencils to pens)
7:3 (second box, coloured pencils to crayons)
The probability of picking a pen (1st box): 5/10
The probability of picking a crayon (2nd box): 3/10
Probability of picking both: 5/10*3/10 = 15/100
I think it is 1/8 I could be wrong though ..