book Maths Puzzle Numerical Ability

Find the sum,diferrence,product,and quotientof the monomials 24z and 6z

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book Other Question

Please tell me what difference is between the two formulas. I know the answer but I want to know the significance between the two.

A=15
B=25

formula 1
(A/B)-1=
Answer: = In his outboard, Kirk can travel 13.5 miles against the river current in 3 hours. In the same time, he can travel 22.5 miles with the current. What is the speed of the boat in stil