4) Let the number be : N
Given : 10% of this number is 25
![\sf{\implies 10\% \ of \ N = 25}](https://img.qammunity.org/2022/formulas/mathematics/high-school/g0zjy90oa23kpbr7rr636433dyldio6dly.png)
![\sf{\implies (10)/(100) * N = 25}](https://img.qammunity.org/2022/formulas/mathematics/high-school/5gs7j1802ohrloee79lga8rgpw466mxy1q.png)
![\sf{\implies (N)/(10) = 25}](https://img.qammunity.org/2022/formulas/mathematics/high-school/ftkgaqtyncd3bqqmj1v2o46rdlxlc2b8pm.png)
![\sf{\implies N = 250}](https://img.qammunity.org/2022/formulas/mathematics/high-school/p8f5sppxczpabyhxak34tzc7olyzq1ew6l.png)
Now we need to find 60% of 250
![\sf{\implies (60)/(100) * 250}](https://img.qammunity.org/2022/formulas/mathematics/high-school/6px5kp5rzlhez5xzn78gehuf1k7q8oy4t6.png)
![\sf{\implies 6 * 25}](https://img.qammunity.org/2022/formulas/mathematics/high-school/rdo2ldu7ufh8zirkfyfabp1lkbvqxccqgd.png)
![\sf{\implies 150}](https://img.qammunity.org/2022/formulas/mathematics/high-school/vlzd3n5zdngoh369sn9inwu6zmr4d9n3ic.png)
5) Given : James left the home at 10 : 00 AM
First : He will meet his friend Tom at the skate park which is 15 minutes walk from his home.
So, James reached the skate park 10 : 15 AM
Second : They stayed at the skate park for an hour
So, till 11 : 15 AM James and Tom were at skate park
Third : Then they will take a 10 minutes walk over to the Burger bar
So, James and Tom reached the Burger bar at 11 : 25 AM
6) First let us find 75% of 80
![\sf{\implies (75)/(100) * 80}](https://img.qammunity.org/2022/formulas/mathematics/high-school/wzqj4b1m71lxltav3ptb4y6py9cwo8bh05.png)
![\sf{\implies 15 * 4}](https://img.qammunity.org/2022/formulas/mathematics/high-school/3hl6q4u0lxk85kmpmpivx1utbkdhih0aj3.png)
![\sf{\implies 60}](https://img.qammunity.org/2022/formulas/mathematics/high-school/lktrwandis1k3lby0fshl24j8fs3gmsy51.png)
Now let us find 40% of 30
![\sf{\implies (40)/(100) * 30}](https://img.qammunity.org/2022/formulas/mathematics/high-school/h6q3o4cr41v4gxqj7n786m5j09pxnr0dwi.png)
![\sf{\implies 12}](https://img.qammunity.org/2022/formulas/mathematics/high-school/gr9foczatlqi9hjzgso8s4haan877v7v3n.png)
Now, (60 - 12) = 48
Answer: 75% of 80 is 48 greater than 40% of 30
7) Given : Journey to school takes 70 minutes
We know that : 1 hour = 60 minutes
So, 70 minutes = 1 hour + 10 minutes
Given : Boy leaves the home at 0715
Answer: The Boy arrives at 0825