exam Maths Puzzle Numerical Ability

A motorboat travels 414km in 6 hours going upstream and 856km in 8 hours going downstream. What is the speed of the boat in still water, and what is the speed of the current?

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exam Other Question

Find the value of x.

x=3s
x=(a+15)
s=(a-1) please help me:

the sum of the digits of a two-digit number is 12. if the digits are reversed, the new number is 15 more than twice the original number. what is the original number?