Question

A​ person's blood type is denoted with the letters​ A, B, and​ O, and the symbols​ + and - . The blood type​ A+ is read as A positive. The blood type B - is read as B negative. Use the data to write a ratio for the comparison in 3 different ways.

Answer 1

(a) O+ to A+

`O+:A+=90:45`

`O+:A+=18:9`

`O+:A+=2:1`

(b) AB- : AB+

`AB-:AB+ = 6:4`

`AB-:AB+ = 3:2`

`AB-:AB+ = 12:8`

(c): B+ to total

`B+ : Total = 20 : 195`

`B+ : Total = 4 : 39`

`B+ : Total = 40 : 390`

Explanation:

Given

`A+ = 45`
`B+ = 20`
`AB+ =6`
`O+=90`

`A-=21`
`B-=0`
`AB-=4`
`O-=9`

`Total = 195`

See attachment

Required

Solving (a): O+ to A+

We have:

`A+ = 45`

`O+=90`

So, the ratio is:

`O+:A+=90:45` ---- first comparison

Divide by 5

`O+:A+=90/5:45/5`

`O+:A+=18:9` ---- Second comparison

Divide by 45

`O+:A+=90/45:45/45`

`O+:A+=2:1` ---- Third comparison

Solving (b): AB- to AB+

We have:

`AB+ =6`

`AB-=4`

So, the ratio is:

`AB-:AB+ = 6:4` ---- first comparison

Divide by 2

`AB-:AB+ = 6/2:4/2`

`AB-:AB+ = 3:2` ---- Second comparison

Multiply by 2

`AB-:AB+ = 6*2:4*2`

`AB-:AB+ = 12:8` ---- Third comparison

Solving (c): B+ to total

We have:

`B+ = 20`

`Total = 195`

So, the ratio is:

`B+ : Total = 20 : 195` ---- first comparison

Divide by 5

`B+ : Total = 20/5 : 195/5`

`B+ : Total = 4 : 39` ---- Second comparison

Multiply by 2

`B+ : Total = 20*2 : 195*2`

`B+ : Total = 40 : 390` ---- Third comparison