exam Maths Puzzle Numerical Ability

Marge can paint her house in 12 hours. If John helps her it takes them 9 hours. How long does it take John to paint the house by himself

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exam Other Question

9x-3y=24
7x-3y=20
using the elimination method On June 1st, a school teacher signed a 2-month note for $600 at 12% to pay for a vacation. On July 1st, he paid $300 on the loan, and July 31st, he paid off the loan. What is the