If a number a (a is not equal to 0) is a natural number, then 1 / 4 divided by a = () multiplied (), 1 / 4 divided by 4 = () multiplied () = ()

If a number a (a is not equal to 0) is a natural number, then 1 / 4 divided by a = () multiplied (), 1 / 4 divided by 4 = () multiplied () = ()

1 / 4 divided by a = (1 / 4) times (1 / a), 1 / 4 divided by a = (1 / a) times (1 / 4) = (1 / (4a))
/It's a fraction

There are four natural numbers a.b.c.d. their sum does not exceed 400, and a divided by B quotient is more than 5, divided by C quotient is more than 6, divided by D quotient is more than 7

5b+5=6c+6=7c+7=a
5(b+1)=6(c+1)=7(d+1)=a
So a is the common multiple of 567, and the minimum is 5 * 6 * 7 = 210
The biggest one is 420. It's more than 400
So B = 41, C = 34, d = 29
So a + B + C + D = 210 + 41 + 34 + 29 = 314

What is 18.76 + 4.32 + 0.15

23.23

15 / 18 - 15 / 18 equals

15/18-15/18＝0