Ken had $15 more than Lisa at first. After Ken gave some of his money to Lisa, he had $21 less than Lisa. How much money

Question

Ken had $15 more than Lisa at first. After Ken gave some of his money to Lisa,
he had $21 less than Lisa.
How much money did Ken give to Lisa?

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Thiên Hương 6 months 2021-07-31T04:00:24+00:00 1 Answers 35 views 0

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    2021-07-31T04:02:09+00:00

    Answer: $18

    Step-by-step explanation: Ken has $15 more. If he gives this $15 to Lisa, Lisa will have $15 more than him. Now if he gives $1 more his amount will decrease by $1 while Lisa’s will increase by $1. So the difference increases by $2. The difference change is always twice the amount given. From $15 more to $21 more, that’s a change in difference of $6. So $6 ÷ 2 = $3. He gives Lisa $3 on top of that $15 so that mean $18 was given.

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