ICSE ICSE Class 7 - CISCE Question Bank Solutions

The following table shows number of males and number of females of a small locality in different age groups.

If one of the persons, from this locality, is picked at random, what is the probability that

1. the person picked is a male?
2. the person picked is a female?
3. the person picked is a female aged 21-50?
4. the person is a male with age up to 50 years?

Are the following pairs of angles complementary? 
10° and 80°

Are the following pairs of angles complementary?
37° 28′ and 52° 33′

Are the following pairs of angles complementary?
(x + 16)° and (74 − x)°

Are the following pairs of angles complementary?
54° and `2/5` of a right angle.

Are the following pairs of angles supplementary?
139° and 39°.

Are the following pairs of angles supplementary?
26° 59′ and 153° 1′.

Are the following pairs of angles supplementary?
2x° + 65° and 115°− 2x°

Are the following pairs of angles supplementary?
`3/10` of a right angle and `4/15` of two right angles.

If 3x + 18° and 2x + 25° are supplementary, find the value of x.

If two complementary angles are in the ratio 1 : 5, find them.

If two supplementary angles are in the ratio 2 : 7, find them.

Enclose the given term in bracket as required:

x – y – z = x - {…….)

Enclose the given term in bracket as required:

x² – xy² – 2xy – y² = x² – (……..)

Three angles which add up to 180° are in the ratio 2 : 3 : 7. Find them.

Enclose the given term in bracket as required:

4a – 9 + 2b – 6 = 4a – (……..)

Enclose the given term in bracket as required:

x² -y² + z² + 3x – 2y = x² – (……..)

Enclose the given term in bracket as required:

– 2a² + 4ab – 6a²b² + 8ab² = – 2a (………)

20% of an angle is the supplement of 60°. Find the angle.

Simplify: 2x – (x + 2y- z)