Question

What percentage of numbers from 1 to 70 have squares that end in the digit 1?

Answer 1

the possible numbers are
1,11,21,31,41,51,61
9,19,29,39,49,59,69
percentage=(14/70)×100=20%

Answer 2

Answer:

Percentage of numbers between 1 and 70 whose squares end with number 1

Step-by-step explanation:

Now if we look at all numbers between 1 to 70, we have a total of 70 numbers. But if we look at the squares of all these 70 numbers which end with 1 in units place, then the numbers are limited….

1, 3, 11, 19, 21, 29, 31, 39, 41, 49, 51, 59, 61, 69.

These are only 14 in number.

So percentage of squares of these numbers = 14 of 70.

If the percentage is X,

Then X% of Y = Z (where Z = 14 and Y = 70.

X% of 70 = 14

X / 100 x 70 = 14

X = 14 x 100 / 70

X = 20%.

The correct answer is 20 %.