Question

the ratio of present ages of mother and son is 12:5 the mother age at the times of birth of the sun was 21 years find their present age

Answer 1

at the time of birth means mothers age - sons age
12x-5x

HOPE YOU UNDERSTAND

Answer 2

Step-by-step explanation:

ANSWER EXPLANATION: There are two ways to solve this question. The faster way is to multiply each side of the given equation by ax−2 (so you can get rid of the fraction). When you multiply each side by ax−2, you should have:

24x2+25x−47=(−8x−3)(ax−2)−53

You should then multiply (−8x−3) and (ax−2) using FOIL

24x2+25x−47=−8ax2−3ax+16x+6−5

Then, reduce on the right side of the equat4x2+25x−47=−8ax2−3ax+16x−

Since the coefficients of the x2-term have to be equal on both sides of the equation, −8a=24, or a=−e other option which is longer and more tedious is to attempt to plug in all of the answer choices for a and see which answer choice makes both sides of the equation equal. Again, this is the longer option, and I do not recommend it for the actual SAT as it will waste too much time.