4 _ 4 _ 4 _ 4 = 20 How?

There is no solution to the problem as you described it (filling in the blanks with +, -, *, or /, and no insertion of brackets allowed)

The following is a list of numbers that it is possible to make by filling in the blanks in 4 _ 4 _ 4 _ 4 with +, -, *, or /:

-60, -16, -15, -8, -7, -3.75, -1, 0, 0.0625, 1, 2, 3.75, 4.25, 7, 8, 9, 15, 16, 17, 24, 32, 60, 68, 256.

The number 20 is not among the possibilities.

Are we allowed :-

4 ! + 4 - 4 - 4 = 20
OR
4 x 4 + √ 4 + √ 4 = 20

ie FOUR FOURS in each case.

4/4+4*4=20
This is right one.

4/4+4*4=20

(4/4 + 4) x 4 = 20

I don't think it's possible.

Addition and subtraction alone will not go above 12.

multiplication and addition and subtraction gets you

4 * 4 + 4 – 4
4 * 4 + 4 + 4
4 * 4 – 4 – 4

and they don't work

triple multiplication will always get too large a number.

4 * 4 * 4 – 4

division will get you always too small a number

4 / 4 + 4 + 4

division combined with multiplication

4 * 4 / 4 + 4
4 / 4 * 4 + 4

double division, doesn't work either

4 / 4 / 4 + 4 = 4 * 4 / 4 + 4

nothing left that I can see

.

4 / 4 + 4 * 4 = 20

square root of 4 + square root of 4 + 4*4. you did not say square roots are not allowed?