MATH CASA Questions with Complete
Solutions (Latest 2025)
In a class of 42 students, 18 are boys. Two girls get
transferred to another school. What percent of students
remaining are girls? - Correct Answers ✅E.
The entire class has 42 students, 18 of which are boys,
meaning 42-18=24 is the number of girls. Out of these 24
girls, 2 leave; so 22 girls are left. The total number of
students is now 42-2=40. 22/40*100=55%
A payroll check is issued for $500.00. If 20% goes to bill, 30%
of the remainder goes to pay entertainment expenses, and
10% of what is left is placed in a retirement account, then
approximately how much is remaining? - Correct Answers
✅B
If out the entire paycheck, 20% is first taken out, then the
remainder is 80%. Of this remainder, if 30% is used for
entertainment, then (.8-.80*.30)=.560 is left. If 10% is put
into a retirement account, then (.56-.56*.1)=.504 is
remaining. So out of $500, the part that remains is 50%,
which is $252.
A painting by Van Gogh increased in value by 80% from last
year 1995 to year 2000. If in year 2000, the painting is worth
$7200, what was its value in 1995? - Correct Answers ✅D
In 2005, the value was 1.8 times its value in 1995. So 1.8
times its value in 1995. So 1.8x=7200~x=4000
"Dresses and Ties" sells a particular dress for $60 dollars.
But, they decide to discount the price of that dress by 25%.
Solutions (Latest 2025)
In a class of 42 students, 18 are boys. Two girls get
transferred to another school. What percent of students
remaining are girls? - Correct Answers ✅E.
The entire class has 42 students, 18 of which are boys,
meaning 42-18=24 is the number of girls. Out of these 24
girls, 2 leave; so 22 girls are left. The total number of
students is now 42-2=40. 22/40*100=55%
A payroll check is issued for $500.00. If 20% goes to bill, 30%
of the remainder goes to pay entertainment expenses, and
10% of what is left is placed in a retirement account, then
approximately how much is remaining? - Correct Answers
✅B
If out the entire paycheck, 20% is first taken out, then the
remainder is 80%. Of this remainder, if 30% is used for
entertainment, then (.8-.80*.30)=.560 is left. If 10% is put
into a retirement account, then (.56-.56*.1)=.504 is
remaining. So out of $500, the part that remains is 50%,
which is $252.
A painting by Van Gogh increased in value by 80% from last
year 1995 to year 2000. If in year 2000, the painting is worth
$7200, what was its value in 1995? - Correct Answers ✅D
In 2005, the value was 1.8 times its value in 1995. So 1.8
times its value in 1995. So 1.8x=7200~x=4000
"Dresses and Ties" sells a particular dress for $60 dollars.
But, they decide to discount the price of that dress by 25%.
