Verified answer

===== PascalABC.NET =====

begin

// 1

var a := ReadArrInteger(10);

a.Transform(p -> 5 * p);

a.Println;

a.Aggregate(BigInteger.One, (u, v) -> u * v).Println;

// 2

var b := ReadArrInteger(6);

b.Count(p -> (p > 0) and p.InRange(1, 9)).Println;

// 3

var c := ReadArrInteger(8);

c.Where(p -> (p mod 10 = 0) and p.InRange(150, 250)).Println

.Sum.Println;

// 4

var d := ReadArrInteger(5);

d.Where(p -> p mod 10 = 4).Min.Println

end.