Question

A school libary has 260 dvds in its collection. Given that 45% of the dvdas are science and 40% are about history. How many of the dvds are about other subjects?

Answer 1

39 DVDs

Explanation:

45% of 260

45/100 ×260

117 DVDs of science

40% of 260

40/100 × 260

104 DVDs of history

So from total subjects science and history

260 - (104+117)

260 - 221

39 DVDs of other subjects

In an easiest way 40 + 45

85% of science and history

So 15 % of other subjects

15/100 × 260

39 DVDs

Answer 2

There are 39 dvds of other subjects

Explanation:

science= 45% of 260

`=(45)/(100)*260=9*13=117\\\\History=(40)/(100)*260=104\\\\\\Othersubjects=260-(117+104)=260-221=39`

OR

100 - (45+40)= 100- 85 = 15%

Other subjects = 15% of 260

`=(15)/(100)*260=3*13=39`