The quotient of a divided by B is two fifths. The sum of a and B is 21. What is a and B

The quotient of a divided by B is two fifths. The sum of a and B is 21. What is a and B

A: 6. B: 15

3 / 4 divided by 16 means () (meaning)

Divide 3 / 4 by 16: divide 3 / 4 into 16 equal portions

3.14 divided by 4 means 1 / 4 of a circle?

Make a bold guess
Is the circumference or area of this circle 3.14
Then find the length or area of 1 / 4 arc?

- 3 - [- 5 + (1-0.2 divided by three fifths) divided by minus 2]

(1 / 2 + 1 / 3 + 1 / 4 + 4 / 5 + 1 / 6) divided by (1 / 60) =?

(1/2+1/3+1/4-4/5+1/6)÷(-1/60)
=-(1/2*60+1/3*60+1/4*60-4/5*60+1/6*60)
=-(30+20+15-48+10)
=-7

(negative two fifths a to the third power B to the fourth power C) divided by (negative one fourth AB to the second power)

(negative two fifths a to the third power B to the fourth power C) divided by (negative one fourth AB to the second power)
=(-2a^3b^4c/5)/(-ab^2/4)
=(2a^3b^4c/5)*(4/ab^2)
=8a^2b^2c/5

A + B = 3, ab = - 2, find the cubic power of a + A ^ B + AB ^ + B

a+b=3
square
a²+b²+2ab=9
ab=-2
So a & sup2; + B & sup2; = 9 + 4 = 13
Original formula = A & sup2; (a + b) + B & sup2; (a + b)
=3a²+3b²
=3(a²+b²)
=39

The third power of (- AB) divided by the second power of (- AB)

Analysis
（-ab²)³÷（-ab)²
=(-a³b^6)÷（a²b²)
=(-ab^4)

Given that a + B = 4AB = two fifths, find the value of the cubic power B-A & # 178; B + AB & # 178; of A

A cubic B-A & # 178; B + AB & # 178;
=ab(a²-a+b)
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Three and two-thirds divided by three and two-thirds divided by seven and three fifths =?

Three and two-thirds is 23 / 7, three and two-thirds is 11 / 3, seven and three-fifths is 38 / 5
The title is very simple (23 / 7) * (3 / 11) * (5 / 38) = 2602 / 385