Answer: At present there are 7 East Indian and 9 Julie mangoes in the basket
Step-by-step explanation:
If you take 3 from 7 and add 3 to 9 you get 12 Julie mangoes and 4 East Indian. 4x3=12.
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Due to the conditions, my answer would be 100.
Factorizing an expression involves writing the expression in simpler forms
The values of z are
or 
The equation is given as:

Expand the equation

Factorize the expression:

Factor out z - 4

Split
or 
Solve for z
or 
Hence, the values of z are
or 
Read more about factorization at:
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When the lines are parallel and angles are given, and since a straight line is 180°, the 2 angles of the line intersecting the parallel lines have to add up to be 180. Therefore,
21. 31°
22. 96°
23. 149°
24. 84°
25. 53°