# Mathematics [NSTSE (National Science Talent Search Exam- Unified Council) Class 8]: Questions 70 - 73 of 1201

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## Question 70

Edit

### Question

MCQ▾

The twice the son’s age in years is added to the father’s age, the sum is 50. But if twice the father’s age is added to the son’s age, the sum is 85. Then the ages of father and son respectively are:

### Choices

Choice (4)Response

a.

45 yrs, 10 yrs

b.

30 yrs, 15 yrs

c.

40 yrs, 5 yrs

d.

25 yrs, 10 yrs

## Question 71

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### Question

MCQ▾

How much pure alcohol should be added to 300 ml of strength 20 % to make its strength 45%?

### Choices

Choice (4)Response

a.

198 ml

b.

154 ml

c.

167.36 ml

d.

136.36 ml

## Question 72

Mathematics
Edit

### Question

MCQ▾

Express as rational number.

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 73

Edit

### Question

MCQ▾

PQ and RS are diameters. Then PRQS is:

### Choices

Choice (4)Response

a.

Isosceles trapezium

b.

Rectangle

c.

Trapezium

d.

Square