Explanation

Let's compare the fractions:

• 1/2​=0.5

• 4/5​=0.8

• 5/8​=0.625

Clearly,

4/5​>5​/8>1/2​

Correct answer: (B) 4/5

Explanation

During photosynthesis, plants use water (H2O) along with carbon dioxide (CO2) to produce glucose and oxygen.

The oxygen released comes specifically from the water molecule.

Being split apart to provide the oxygen atoms needed for the glucose molecule. 

Explanation

The animal that uses echolocation for movement is the bat. 

Bats use high-frequency sound waves to navigate

And find food in the dark by emitting sounds

And then listening to the echoes that bounce back off objects. 

Explanation

"Receives" correctly fits as charities typically receive funds from donors.

It matches the subject-verb agreement and the context of funding through private donations.

Explanation

The correct word to replace "aboriginal" in this context is "Primitive".

Explanation

 Iran launched monkeys into space in 2013, specifically in January and December.

The first monkey, named Fargam, was launched in January

And the second one was launched in December. 

Explanation

Total people = 100

Pepsi drinkers = 50

Coke drinkers = 40

Both = 20

People drinking Pepsi or Coke = Pepsi + Coke - Both

= 50 + 40 - 20

= 70

People drinking neither = Total - People drinking Pepsi or Coke

= 100 - 70

= 30

Explanation

Sara is the tallest girl in our school.

“The tallest” is a superlative form that compares more than two.

Explanation

1. Divide 3239 by 2923:

$$3239÷2923=1\text{(remainder = 3239 - 2923 = 316)}$$

2. Now, divide 2923 by 316:

$$2923÷316=9\text{(remainder = 2923 - 9 × 316 = 2923 - 2844 = 79)}$$

3. Now, divide 316 by 79:

$$316÷79=4\text{(remainder = 316 - 4 × 79 = 316 - 316 = 0)}$$

Since the remainder is 0, the H.C.F is 79.

Explanation

Work done by 12 men in 4 days = 1 (full work)

Work done by 1 man in 4 days = 1/12

Work done by 6 men in 4 days = 6/12 = 1/2 (i.e., half of the work)

Work done by 6 men in 2 days = (1/2) × (2/4) = 1/4

Remaining work = 1 - 1/4 = 3/4

15 women complete the full work in 4 days → 1 woman’s 1-day work = 1/(15 × 4) = 1/60

Work needed in 3 days → x women × 3 × (1/60) = 3/4

x = (3/4) × (60/3) = 15 women