exam Maths Puzzle Numerical Ability

Use the substitution method to solve the linear system.

y = x - 4
4x+y = 26

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I need help in figuring out these kind of problem please. can I get a example of how to do this. problem 12/16 times 4/3 divided by 5/6. The Jaspers have a jar where they collect nickels, dimes, and quarters. When they count the change in the jar, there are twice as many nickels as there are quarters. If there is $1