Henry is buying school supplies for the start of the school year. for every 3 pencils he buys 2 pens. if henry buys 21 pencils ,how many total pencils and pens dis henry purchase?

d) 30 units^2

area of rectangle = l × b

we know,

length = 10 unit

breadth = 3 unit

applying the formula,

= l × b

= 10 × 3

= 30 unit^2

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fist on the left goes with the third on the right. second on the left goes with the fourth on the right. third on the left goes with the second on the right. the fourth on the left goes with first on the right