There are two labs in a school in lab -1 last year there were 610 boys, this number is decreased by 20 per cent this year, the number of girls is 175 per cent of total number of boys lab-1 this year. In lab 2,60% of students are boys, In the lab examination 80% of girls scored more than 40 marks 60% of total students scored more than 40 marks in same exam the maximum marks fixed are 150
how many girls are there in lab-1 this year

Options

A. 675
B. 854
C. 792
D. 680

Answer

To find the number of girls in Lab-1 this year, we can follow these steps:

### Step 1: Calculate the number of boys in Lab-1 this year.
Last year, there were 610 boys. This year, the number of boys decreased by 20%.

\[ \text{Number of boys this year} = 610 - (20\% \text{ of } 610) \]
\[ = 610 - (0.20 \times 610) \]
\[ = 610 - 122 = 488 \]

### Step 2: Calculate the number of girls in Lab-1 this year.
The number of girls is given as 175% of the total number of boys in Lab-1 this year.

\[ \text{Number of girls this year} = 175\% \text{ of } 488 \]
\[ = \frac{175}{100} \times 488 \]
\[ = 1.75 \times 488 \]
\[ = 854 \]

### Final Answer:
The number of girls in Lab-1 this year is **854**.

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