exam Maths Puzzle Numerical Ability

I am trying to simplify the following cube root 40 times 4 cuberoot 5
40^1/3 * (4)5^1/3 . I'm not sure if I multiply the 5 *40 and get 4(200^1/3) or can it be simplified more? Tha

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Problem: Use the digits 1-9 in order. Insert operation signs and add grouping symbols to got the value of 100. Four brothers decided to buy a stereo that cost $280. Their contributions were in the ratio of 4:2:3:5. What was the largest single contribution in dollars?