you don't have enough info, we need to know how old he was when he was twice her age, or how old she was
Answer:
Step-by-step explanation:
we have
step 1
Solve the numerator of the quotient
step 2
substitute in the original expression
step 3
simplify
16.88
523.12
at least for the question i got
If it decreases by 80٪, then only 20٪ remains.
15×20٪=15×20/100=15×0.2=3
Answer: 3