Write variable equations: word problems — task. Mathematics State Board, Class 7.

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Last weekend, Colin collected red leaves for an art project. On Saturday he collected

$10$ red leaves, and on Sunday he collected some more in the park. Now he has

$20$ red leaves. Which of the following equation when solved will give how many red leaves Colin collected on Sunday?

Answer variants:

$10 + r = 20$

$20 \div r = 10$

$r \div 20 = 10$

$20 \times r = 10$

Note: 'r' is a variable to represent the unknown number of red leaves.

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5. Write variable equations: word problems