GCSE Maths Practice: forming-equations

Question 6 of 10

This question practices forming and solving equations from ages in a word problem.

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\( \begin{array}{l}\text{Ali is twice as old as his sister,} \\ \text{and their total age is 21 years.} \\ \text{Form and solve an equation to find the sister's age.}\end{array} \)

Choose one option:

Double-check multiplication and addition when solving.

Set up the sum of the ages equation, then solve for x.