Question

Ex: Find the two numbers whose sum is 85 and whose difference is 15
Ans: 50 and 35
Ex: A boat man goes 96km in 8hrs with the flow of a river. If the speed of the river is 2k/ph, find the
speed of the boat?
Ans: let the speed of the boat be x k/h
Speed of the boat with the flow of river will be (x+2) kph
D Focus​

Answer 1

Answer:

a) The Numbers are 50 and 35

b) Speed Of Boat Is 18 km/h

Step-by-step explanation:

a) Let the Numbers be x and y :-

Sum Of The Numbers is 85 , Therefore :-

=> x + y = 85

=> y = 85 - x (Equation i)

Difference of numbers is 15 , Therefore :-

$x - y = 15 \\ = )x - (85 - x) = 15 \: \: (from \: equation \: i) \\ = )x - 85 + x = 15 \\ = )2x - 85 = 15 \\ = )2x = 85 + 15 \\ = )2x = 100 \\ = )x = 50$

Thus The Numbers are :-

i) x = 50

ii)y => 85 - x

=> 85 - 50

=)35

b)

Speed Of Boat :-

Distance = 96km

Time = 8 hrs

Therefore :-

$speed \: = \frac{distance}{time} \\ = ) \frac{96}{8} \\ = )16km.h {r}^{ - 1}$

Speed of Boat With flow of river :-

=> Speed Of Boat + Speed of river

=> 16 + 2

=> 18 km/h

Hope it helped

Answer 2

You already got the answer of 2nd question so I will solve your first question, Just see the attachment