Pam invested $4200 in a savings account with a yearly interest rate of 4% for 7 years. how much simple interest did she earn? a. $1176 b. $578 c. $152 d. $1422

4200 * 4% * 7 = 1176

Your answer is A.

Let Ted be x.

Ed is 7 years older =  x  + 7

Ed = (3/4)Ted

(x + 7) = (3/4)x

x + 7 = 3x/4

x - 3x/4 = -7

x/4 = -7

x = -28,           Ted = -28 years

(x + 7) = -28 + 7 = -21,      Ed = -21 years.

Goodness. We had negative numbers for the ages, well does that make sense?  No it doesn't.

Our answer is correct. But the sense in the question is lacking. The question has been wrongly set.

We might assume negative ages to mean before they came into the world, before birth!