Question

Dahlia has just enough money to buy either 6pears and 20oranges or 12oranges and 11pears. A pear costs $0.80. How much does an orange cost?

Answer 1

20 - 12 = 8 oranges;
11 - 6 = 5 pears;
8 oranges costs as much as 5 pears;
But, 5 pears costs 5 × 0.80 = $4;
Then, an orange cost 4 ÷ 8 = $0.5;