book Maths Puzzle Numerical Ability

Solve by the substitution method
2x-y=4
2x-y=3

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book Other Question

Can you please help with the following? A work crew of 3 people requires 3 weeks and 2 days to do a certain job. How long would it take a work crew of 4 people to do the same jo Express the statement in terms of an inequality involving an absolute value. The radius r of a ball bearing must be within 0.01 cm. of 1 cm.