On every one of Alex’s birthdays riddle

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Riddle: On every one of Alex’s birthdays, his parents put into a piggy bank the number of coins equal to his age. Now there are 36 coins in the piggy bank. How old is Alex


Answer: The correct answer is 8. Alex is 8 years old. Let’s explain.
1 in his 1st birthday
2 in his 2nd => 1+2=3


3 in his 3rd =>3+3=6
4 in his 4th => 6+4=10
5 in his 5th => 10+5=15

6 in his 6th => 15+6=21
7 in his 7th => 21+7=28


8 in his 8th => 28+8=36
so total of 36,  therefore Alex is now 8 years old.


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