book Maths Puzzle Numerical Ability

1/2+7/10x=13/20
solve for x

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book Other Question

Bob and Moe set off at the same time on a 30 km walk for charity. Bob walks 1.4 km/hr faster than Moe, but stops to talk to a friend for 20 minutes. Even with this delay Bob finish If Wendy get 10 hours added to her vacation time for every month that she works. How many days can she take off for vaction having worked 8 months?