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Isaac spends 30 hours on learning music instruments per week. He spends 40% of the time on piano, 25% of the time on guitar and the remaining on violin. If he wants to increase the learning time for piano by 15% without decreasing the learning time for guitar,

(a) How much time should he spend on violin per week?

hours

(b) What’s the time difference of learning piano after his changing?

hours

Correct!