Question

b)
c) -150+ [25 of 10 - {(–50) + (-2 of 5) - 40}]
d) 650 × (-2) + 47 - (45) + {20 of (4 - 50) +2}
7. A water tap fills water at the rate of 25 L per minute into a water tank. Another water tap can fill water
in the same tank at the rate of 15 L per minute. If both the water taps are opened, then the water tank is
filled in 15 minutes. Find the volume of the water tank.
8. Amir rides his bike at the speed of 28 kmph in east for 3 hours and then at the speed of 35 kmph in
west for 5 hours. Find the distance between his final position and initial position.
9. A fish is at 125 m below the sea level. It rises 56 m, then dives 48 m and then rises 25 m again. Find
the fish's position from the sea level.
0. A submarine is at 350 m below the sea level. It ascends for 10 seconds and then stops. Its final position
is at 100 m below the sea level. Find the speed of the submarine.
1. A building of 50 floors. Every floor of the building is 6 m high. If its elevator moves 3 m per second,
then how long will it take to move from second floor to 42nd floor?
2. Rahul throws a ball in air. The ball goes up to the height of 21 m and settles at the bottom of a pond, 12
m deep. Find the total distance covered by the ball.
. In a test of 50 questions, +5 marks are given for each correct answer, -1 mark is given for each
incorrect answer and 0 for not attempting. Rahul completed this test with 42 correct answers and 5
incorrect answers. Find the marks obtained by Rahul in the test.
1. What will be the sign of the product, if 18 positive integers and 23 negative integers are multiplied
together?
roject Work​

Answer 1

sorry bro no idea what is your question tell me short form

Answer 2

Step-by-step explanation:

It's 7th one answer.

$a + b ={ lcm} \: - 120unit \: \\ \frac{120}{1} = + 20minutes$

$= 2 \\ a + b = 3 - 2 = 1unit. = 60minutes$