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Singapore Word Problem Answer


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This is a problem from book 4

Vivian has 5 times as many stickers as Irene. After giving 20 stickers to Irene, Vivian has twice as many as Irene, and 10 more than Pam. How many stickers does Pam have?

Does anyone know how to solve this using the bar model.

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The answer was 70

I am not sure how to draw the model here, but

Vivian had 5 units and Irene 1 unit

When Vivian gave Irene 20 stickers,

Vivian had 4 units and Irene had 2 units which is twice as many for Vivian than Irene.

So one unit is 20 stickers.

So in total now Vivian had 80 stickers

So 80-10=70

Which is what Pam has

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