book Maths Puzzle Numerical Ability

2
what is (-2)(-5) (3)

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book Other Question

simplify the expression (1/y)-(1/y-3).

a. 1/3

b. -3/y(y-3)

c. 3/y2-3

d. 2y-3/y(y-3)

I know/think the LCD should be y(y-3)and i know i am supposed to multiply the num 2.56 X 10^9