Maths Olympiad Prep

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, 2020

Algebra Difficulty 1.3 Junior Find the answer Canada

Roman wins a contest with a prize of $200. He gives 30% of the prize to Jackie. He then splits 15% of what remains equally between Dale and Natalia. How much money does Roman give Dale?

$10.50\$10.50
$15.00\$15.00
$4.50\$4.50
$25.50\$25.50
$59.50\$59.50

A number or a short expression. Fractions can be typed as 3/2, and spacing doesn't matter.

Solution

To determine 30% of Roman’s 200prize,wecalculate200 prize, we calculate \$200 ×\times 30\% = \$200 ×30100\times \frac{30}{100} = \$2 ×\times 30 = \$60$.

After Roman gives 60toJackie,hehas60 to Jackie, he has \$200 - \$60 = \$140$ remaining.

He splits 15% of this between Dale and Natalia.

The total that he splits is $140×15%=$140×0.15=$21\$140 \times 15\% = \$140 \times 0.15 = \$21.

Since Roman splits 21 equally between Dale and Natalia, then Roman gives Dale a total of \$21 ÷\div 2 = \$10.50$.

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Source: CEMC, University of Waterloo, licensed CC-BY-NC-4.0. Statement reproduced verbatim; metadata (topic, difficulty) added by this project.