SAT Math Practice Question #38829 - SATify | SATify
#38829
algebra
equations
modeling
percentage
word problem
functions
exponential
hard
90 sec
Calculator OK
A radioactive substance decays such that its mass is halved every 12 years. If a sample initially had a mass of 160 grams, how many years will it take for the mass to reduce to 20 grams?
• Up to 5 characters (6 if negative). Only numbers, decimal (.), fraction (/), negative (-). • Fractions must be in lowest terms. • Mixed numbers must be converted to improper fractions.
