Kylo and Quartez had $70 and $60 respectively at first. After Kylo spent $20 and Quartez received some money from his mother, Quartez had twice as much money as Kylo. (a) How much did Kylo have in the end?
(b) How much did Quartez receive from his mother?

a) $50 b) $40

Step-by-step explanation:

Kylo started with $70 and spent $20. This can be written as 70-20, which equals $50.

At the end, Quartez had double what Kylo had. This can be written as 2×50, which is $100. He started with $60, so his mother gave him 100-60 or $40.

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