book Maths Puzzle Numerical Ability

can you show me the steps of answering this problem?

Jim's wekly pay is two thirds of Alicia's. Together they earn $600 per week. What is each person's weekly pay?

Please and

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book Other Question
two trains A and B are 110 km apart on a straight line .one train starts from A at 7am and travels toward b AT 20KM/HR..another train starts from B at 8 am and travels towards A at a speed of 25km/hr...at what time they will meet?

ans:
9am
10am
10.30am
11am CAN YOU PLEASE GIVE ME THE ANSWER FOR 7a to the third power-2a squared+6-7a squared+2a-4