MATHEMATICS MIDDLE SCHOOL

Why is 21/30 greater than 2/3

Answers

Answer 1
Answer: Because 2/3 equals 20/30 and 21/30 is greater than that
Answer 2
Answer: 3x10=30 
2x10=20, so 21 over 30 is a little bigger

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The floor of a hall has an area of 48 dm.The floor is to be tiled by triangular tiles.of sides 20 cm,30 cm and 40 cm. Find the total cost of tiles if cost of each tile is Rs.200.

Answers

The triangle is an obtuse triangle. No sides are equal.
convert cm to dm

1 dm = 10 cm

side a: 20 cm ⇒ 20cm * 1dm/10cm = 20dm/10 = 2 dm
side b: 30 cm ⇒ 30cm * 1dm/10cm = 30dm/10 = 3 dm
side c: 40 cm ⇒ 40cm * 1dm/10cm = 40dm/10 = 4 dm

We need to get the area of a triangle, but first we need to solve for its height using Heron's formula

s = (a+b+c)/2 = (2+3+4)/2 = 9/2 = 4.5
Area = √(s(s-a)(s-b)(s-c)
h3/2 = √4.5(4.5-2)(4.5-3)(4.5-4)
h3/2 = √4.5(2.5)(1.5)(0.5)
h3/2 = √8.44
h3/2 = 2.91
h = (2.91*2)/3
h = 1.94

A = hb/2 = (1.94*3)/2 = 5.82/2 = 2.91 dm²

48 dm² / 2.91dm² = 16.5 or 17 tiles needed

17 x Rs200 = Rs3,400 is the total cost

Write your own story problem using mixed numbers. show the solution

Answers

Answer:

Bryan weighed two pieces of metal for an experiment. The piece of copper weighed 2(4)/(5) pounds and the piece of zinc weighed 4(3)/(5)pounds. Calculate the total metal in pounds he used.

Solution:- Weight of copper metal= 2(4)/(5) pounds

Weight of zinc metal=4(3)/(5)pounds

The total weight of the metal he used=2(4)/(5)+4(3)/(5) pounds

To solve the sum first convert them into like improper fractions

2(4)/(5)\rightarrow(2*5+4)/(5)=(14)/(5)

4(3)/(5)\rightarrow(5*4+3)/(5)=(23)/(5)

Now, The total weight of the metal he used=(14)/(5)+(23)/(5)=(37)/(5) pounds

Ans:- Bryan used (37)/(5) pounds of metal.
Brian brought cookies to school one day for class. He brought two dozen. His class ate 1 1/2 dozen. How many where left?A: 6 cookies

Katie is 6/10 of the way to Brianna's house Larry is 7/10 of the way to Brianna's house how much closer to Brianna's house is Larry?

Answers

7/10 - 6/10= 1/10! So 1/10 is the answer.

Round 18,300,000 to the nearest tenth

Answers

Answer:

18,300,000

Step-by-step explanation:

the problem here is that there is no tenth, hundreth, or ten thousandth place

they try to confuse you so all you have to do is round the closest number to the tenth place which is 3 and 0 can't do anything so it stays the same.

The product of my number and twice my number is 128. what is half my number

Answers

Answer=4

8*16=128
your number is 8
therefore half your number is 4
8/2=4
answer = 4
128÷2=64
8×8 is 64
so your number is 8 and half of 8 is 4.

What is the LCD of 3/10 and -4/15 ?

Answers

The LCD of 3/10 and -4/15 is 30.
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