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Maths Puzzle
Numerical Ability
Solve: (7t-21)+(t+4)=15
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book Other Question
if a boat goes downstream at 72 miles in three hours, and upstream 60 miles in 6 hours, the rate of the river and the rate of the boat in still water respectively are_____________?
please help me with this equation:
i have to use the subtition method to solve the linear system
y=x-4
4x+y=26