self Maths Puzzle

if 1+3+5+7+9+11+13+15+17+19=100,then find out five no.s from the above series which is equal to 50.

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self Other Question

1)b&e are good in mathematics& physiccs 2)a&b are good in art & literature WHO IS GOOD IN PHYSICS?
Tina have some parrots and some cages for it.if she put 4 parrots in each cage then she will have one cage left.if she put 3 parrots in each cage then she will have 1 parrot left over.how many parrots and cages does she have?