Andrea gave away ten ballpens.

Marlon is x years old. In 10 years, he will be 24 years old.

Lucy has 12 balloons. Nora has x balloons. Find the sum of these balloons.

Manuel has ₱100.00. He bought a cap for a certain amount of money, how much money had he left?

There were 48 pupils. They were divided into x groups. How many pupils were in a group?

Find the unknown in the equation, 3x + 5 = 35

What is the missing value in the equation 8 + ___ = 20 – 7?

What is the value of 9b + 3  if   b = 5?

The product of x and 7 is 42. The value of x is ______.

Seven more than x is 9. The value of x is ______.