Happy Birthday!

Number Theory Level 1

Alejandro is older than Lilia by 52 days. This year Alejandro celebrated his birthday on a Tuesday. What day will Lilia celebrate her birthday?

Image Credit: Flickr be'mine .
Thursday Monday Friday Saturday

Dayra Hernández Rodríguez by Dayra Hernández Rodríguez , 27

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2 solutions

Munem Shahriar
Apr 20, 2017

we know one week is 7 days. so, 7 × 7 = 49

Now, After 7×7 days it will be again Tuesday . Add 3 days more will be 52 days.

Again , After 3 days it will be Friday .

Therefore, Lilia will celebrate her birthday on Friday.

2 Helpful 0 Interesting 0 Brilliant 0 Confused
Mohammad Khaza
Jul 21, 2017

as we know one week = 7 days. so, 7 × 7 7 \times 7 = 49 49

Now, After 7 × 7 7 \times 7 days it will be again Tuesday .

and, , After 3 days it will be Friday .

so,, Lilia will celebrate her birthday on Friday

1 Helpful 0 Interesting 0 Brilliant 0 Confused

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