book Maths Puzzle Numerical Ability

-15+7=

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There is a slow leak in your bike tire. Its loding air at a rate of 2 pounds per square inch per day. Let x represent the amount of ari in the tire now. Write an expression for A Metra commuter train leaves Union STation in Chicago at 12 noon. Two hours later, an Amtrak train leaves on the same track, traveling at an average speed that is 50 miles per ho