exam Maths Puzzle Numerical Ability

Can someone help me solve this problem?

Jean deposited a check for $625, wrote two for $68.74 and $29.95 and used her debit card to pay for a purchase of $57.65. How has her account balance changed?

Thanks,
Sher

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exam Other Question

Does anyone know how to do this problem?

I need to find the constant of variation k

M varies directly with N; M = 144 when N= 8

Thanks,
sher Researchers marked and released 36 pike in a pond. Later they counted 20 pike, 12 of which were marked. Estimate the pike population. Thanks