exam Maths Puzzle Numerical Ability

Graph the line using three points
y=1/2x-1

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exam Other Question

In guinea pigs, rough coat (R) is dominant over smooth coat (r), and black coat (B) is dominant over white (b). A rough, black guinea pig bred to a smooth, white one yielded 28 rou Howard adds 3 liters of a 6% salt mixture to 12 liters of an 4% salt mixture. How many liters of mixture does Howard have?