Ricky wrote the following to show that his sister's age is 6 yrs. less than 3 times his age. Explain what he did wrong.
Give the correct expression Let a stand for my age My sister's age a/3-6
ricky's age
sister's age:
6 less than 3 times rick's age ----> 3a - 6
I would never ask for an "explanation" of somebody's illogical thinking
Richard is 6 years older than Lisa, and in 5 years the sum of their ages will be twice as much as the sum of their ages 4 years ago. Find their present ages.
To understand what Ricky did wrong, let's analyze his expression and compare it to the given condition.
Ricky wrote the following expression: "a/3-6", where 'a' represents his age.
According to the given condition, Ricky's sister's age is 6 years less than 3 times his age.
To express this correctly, we first need to determine what "3 times his age" would be. It's simply 3a.
Then, we need to subtract 6 years from this expression to show that his sister's age is 6 years less than that.
So the correct expression should be: "3a - 6" to represent Ricky's sister's age.
Therefore, the correct expression would be "3a - 6", not "a/3-6" as written by Ricky.