Question

Rosa can eat 32 rossogollas in one hour. her sister lila needs three hours to eat the same number. how much will they take to eat 32 rossogollas together?

Answer 1

Heya !!

Rosa will eat = 32 rosogullas per hour. 

Her sister will eat = 32/ 3 rosogullas per hour. 

Total lollies in one hour :-
1 hr = 32 + 32/3 
1 hr = 42 2/3 
1 hr = 128 / 3
3 / 128 hr = 1 rosogulla (x 32) 
32 × (3/128) hr = 32 rosogullas
96 / 128 hr = 32 rosogullas
0∙75 hr = 32 rosogullas

Thus, they will take to eat 32 rossogollas together 45 minutes.

Answer 2

Time taken by Rosa and Lisa together to eat 32 rossogollas will be 45 minutes.

Step-by-step explanation:

Given:

Number of rosogollas eaten by Rosa in 1 hour = 32

Number of rosogollas eaten by Lisa in 3 hour = 32

Now number of rosogollas eaten by Rosa in 1 minute = $\frac{32}{60}$  [1 hour = 60 minute]

Number of rosogollas eaten by Lila in 1 minute =$\frac{32}{180}$  [3 hour = 180 minute]

Number of rosogollas eaten by Rosa and Lila together in 1 minute

= $\frac{32}{60} + \frac{32}{180}$

= $\frac{32\times180+32\times60}{60\times 180}$

= $\frac{5760+1920}{10800}$

= $\frac{7680}{10800}$

= $\frac{128}{180}$

Now time taken by Rosa and Lisa together to eat 32 rossogollas,

=($\frac{32}{\frac{128}{180} }$)minutes

=$(\frac{32\times180}{128} )$minutes

= 45 minutes