book Maths Puzzle Numerical Ability

There are 10 pencils and they need to be allocate to 3 students
3.In how many ways can at least one of the students be assigned zero pencils

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book Other Question

2x+3y=6
4x=6y+3
Two cities on a map were 2 1/4 in. apart. The cities are actually 56.25 miles apart. What scale was used to draw the map?