# Tagged Questions

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I wanted to see if I could answer a post that was above my head specifically this oneby Osksana Gimmel I ran into a road block and couldn't do it. (not that I really thought I could...I just don't ...
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### How to solve age word problems?

Roy is now 4 years older than Erik and half of that amount older than Iris. If in 2 years, roy will be twice as old as Erik, then in 2 years what would be Roy's age multiplied by Iris's age? Is ...
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### Mod Problem solving

I can't do this last question of my homework that's due in tomorrow. Can anyone hint me on what to do? Suppose $p$ is prime and $k$ is a positive integer Show that if $p$ is odd and $x$ is an ...
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### What are the zero-divisors modulo 12 [closed]

I have tried to answer this problem and have had no success
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### Velocity and distance problem

From city A, car a sets on it's road towards city B. 9 Hours later, car b, sets from city B towards city A. The two cars met along the way. At the point of the meeting, car a, passed 240 km more than ...
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### Distance Question

Two trains set out of two cities, A and B, simultaneously; One from A and one from B. Until the meeting one train has passed $108$ km more than the other. Later, one of the trains arrived at it's ...
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### Power calculation problem

Three machines perform together a certain job. If only machine A works, to perform the job alone, it would require a hours more than the time required to perform the job by the 3 machines, when they ...
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### Probability of World Series - Pascal and Fermat [closed]

In the World Series, each opponent attempts to win 4 of 7 games. In 1989, Oakland had already won the first two games as the San Francisco Giants and the Oakland Athletics were getting ready to play ...
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### How to show $A-B \subseteq C \Rightarrow A\cup B \subseteq B\cup C$?

I really need help with this logical proof. Show that $A-B \subseteq C \Rightarrow A\cup B \subseteq B\cup C$. Please show the steps to the solution. Thank you!