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5) complete: 21 , 9 is … … ……
a) if 3 , X , 21 , 35 are proportion
Then X = ………………………..
b) if 5 , 4 , 20 , X are proportion
then X = …………..….…..
c) if X , 10 , 3 , 5 are proportion
then X = …………………………….
d)The forth proportional to the numbers 7 ,
e) The third proportional to the numbers 2 , 3 , 15 is ……..……
6) Amr bought 3 apples for LE 27 find the price of 5 apples
X = …………….. = LE…….
Pens LE
3 27
5 .....
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