exam Maths Puzzle Numerical Ability

please give me "10 examples of mixture problems using equation or linear algebra. two solutions per problem."

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exam Other Question

Good morning, can someone please help me with these problems. I would appreciate it so much.

Solve for x:
Log base 10^7=log base 10^x-log base 10^2

Write as the sum or diff Minimize C=x+y with the following constraints:

0<x<4
0<y<4
2x-3y<-1
-x+y>0

Note: the < signs have a line under