Jill asked in Science & MathematicsMathematics · 1 year ago

# Kamal is 17 years older than Gina. Gina is 3 years younger than Rachelle. If the sum of their ages is 77, how old is Gina?

How do I solve this?

Relevance
• 1 year ago

Equations, that's one way.

K = G + 17

G = R - 3, or R = G+3

K + G + R = 77

Plug in the expressions for K and R

(G +17) + G + (G+3) = 77

Same as 3G + 20 = 77, can you solve that?

• Anonymous
1 year ago

Too old for me. I hear 77 I think purrruuuunnnnneeee!

• 1 year ago

Gina is 19

R=22

K=36

• David
Lv 7
1 year ago

Their ages respectively are: (17+x-3) + (x-3) + (x) = 77

Solving the equation x = 22 and so the age of Gina is 19 years.

• Anonymous
1 year ago

Kamal is 17 years older than Gina.

K = G + 17

Gina is 3 years younger than Rachelle.

R = G + 3

If the sum of their ages is 77

K + G + R = 77

but K = G + 17 and R = G + 3.

Substitute

G + 17 + G + G + 3 = 77

3G + 20 = 77

3G = 57

G = 19

Gina is 19 years old.

• Como
Lv 7
1 year ago

--

Let Rochelle be x years

Gina is x - 3 years

Kenwood is x + 14 years

3x + 11 = 77

3x = 66

x = 22

Gina 19 years

• Mike G
Lv 7
1 year ago

K = G+17

R = G+3

G+K+R = 77

3G+20 = 77

G = 19

Gina is 19 years old

• Dixon
Lv 7
1 year ago

Kamal is 17 years older than Gina. Gina is 3 years younger than Rachelle. If the sum of their ages is 77, how old is Gina?

K = 17 + G

G = R - 3

K + G + R = 77 . . . . . iii

Substituting in iii

(17 + G) + G + (G + 3) = 77

• Anonymous
1 year ago

Gina + 3 = Rachelle

Gina + 17 = Kamal

Gina + 0 = Gina

===============

3 Gina + 20 = 77, so Gina = (77-20)/3 = 19

• 1 year ago

The real problem is that they are all women! If they were men, you could just ASK them how old they are!

Let's take Rachelle's age. Let's call it r.

Gina's age is r-3

Kamal is r - 3 + 17 or r + 14

So the total of all their ages is

r + r - 3 + r + 14 = 77

(The nice thing is this is all addition and subtraction so we don't need parentheses anywhere!)

So that's 3r - 3 + 14 = 77

So 3r + 11 = 77

So 3r = 66

r = 33 That's Rachelle's age, 33 years

Gina is 3 years younger than Rachelle, so she is 30.