Question

rita finished her chemistry assignment in 7/8 hours. Then she completed her math assignment in 1/4 hours. How much more time did rita spend on her chemistry assignment

Answer 1

Rita spend
`(5)/(8)` of hour more on her chemistry assignment.

Explanation:

Fraction of an hour Rita spent on chemistry assignment =
`(7)/(8)`

Fraction of an hour Rita spent on math assignment =
`(1)/(4)`

∴ Fraction of hour Rita spent more on her chemistry assignment than math assignment

⇒
`(7)/(8)-(1)/(4)`

To subtract fractions we take LCD for 4 and 8. Since 8 is the least common multiple for 4 and 8 so, we take LCD= 8

To make the denominators same we need to multiply numerator and denominator of second fraction with 2.

⇒
`(7)/(8)-(1*2)/(4*2)`

⇒
`(7)/(8)-(2)/(8)`

After making the denominators common, we simply subtract numerators.

⇒
`(7-2)/(8)`

⇒
`(5)/(8)`

Therefore, Rita spend
`(5)/(8)` of hour more on her chemistry assignment.