(i) Subtract (−40) from 70 
(ii) Subtract (-12) from (-20)

A shopkeeper earns a profit of Rs. 5 by selling one notebook and incurs a loss of Rs. 2 per pen while selling of his old stock. In a particular day he earns neither profit nor loss. If he sold 20 notebooks, how many pens did he sell?

The price of a plant reduced Rs. 6 per week for 7 weeks. By how much did the price of the plant change over the 7 weeks?

Find the area of the rhombus whose side is 17 cm and the height is 8 cm.

Simplify:100x + 99y – 98z + 10x + 10y + 10z – x – y + z

60 workers can spin a bale of cotton in 7 days. In how many days will 42 workers spin it?

Sumathi sweeps 600 m long road in \(2\cfrac { 1 }{ 2 } \) hrs. Ramani sweeps \(\cfrac { 2 }{ 3 } \)rd of same road in \(1\cfrac { 1 }{ 2 } \) I!hrs. Who sweeps more speedily?

(i) Name the angle that corresponds to \(\angle\)1.
(ii) Name the angle that is alternate interior to \(\angle\)3.
(iii) Name the angle that is alternate exterior to \(\angle\)8.
(iv) Name the angle that corresponds to \(\angle\)8.
(v) Name the angle that is alternate exterior to \(\angle\)7.
(vi) Name the angle that is alternate interior to \(\angle\)6.

If l is parallel to m, find the measure of x and y in the figure.

In the adjoining figure, the lines \(\overleftrightarrow { AB } \) and \(\overleftrightarrow { CD } \) intersect at 'O'. If ∠COD = 50°, find the measures of the other three angles.