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Maths Puzzle
Numerical Ability
y=4-(x-2)^2
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book Other Question
How do you do y= 2x + 3 using substitution?
y= 3x + 1
6. If 6 men can do a piece of work in 14 days, how many men are needed to do the work in 21 days?
a. 3 b. 9 c. 5 d. 4 e. none
The answer on the answer key is D, but I have no clue how to get the same. Please help!