My daughter has a homework question. It shows a small picture of a pelican at one twenty-seventh of its actual size.
The question asks: How many centimetres long is the pelicans beak?
(a) 2.1
(b) 21
(c) 57
(d) 570
On a ruler it measures 1.5cms.
We think its probably (c) 57cms but don't know how to work it out.
Any help on this will be greatly appreciated!
2007-05-06 21:56:34 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
The beak measurement is definately 1.5cm's. Maybe the sheet is incorrect with the answers that its given us....Will check it with her teacher tomorrow. Thanks for all your efforts anyway! Cheers!
2007-05-06 22:18:50 · update #1
Checked with the teacher.....he photocopied the sheet that he handed out and it wasnt original scale - he reduced it. No wonder it wouldnt work out!! Thanks to all those who answered. Cheers!
2007-05-10 20:18:00 · update #2
If its beak is 1.5cm in the picture, then in full scale it should be 1.5 x 27 = 40.5cm. But, since that's not one of the choices, I would say that there's either a problem with the question's answers, or a problem with the original measurement. Could the beak be measured such that it is 0.78cm long (in which case the answer is b), or 2.1cm long (then the answer is c). Measure only the beak, not not the head.
Good luck!
2007-05-06 22:05:54 · answer #1 · answered by so far north 3 · 0⤊ 0⤋
If you are positive that the measurement is 1.5 cms or more, then 57 cms is the only valid answer. Answer d suggests that the pelicans beak is almost 6 meters or 18 ft long. To get only 21 cms for the actual length the scale drawing would have to be about 0.8 cms. I think the intent of the question is for the student to observe how both small and large changes in the scale drawing are reflected on to the actual thing being scaled.
2007-05-06 22:16:08 · answer #2 · answered by Kevin M 3 · 0⤊ 0⤋
Tha actual size is 40.5cm as the image you were shown was 1:27 meaning it was only one twenty-seventh of the original image and so you have to times the smaller image by 27.
I hope this helps,
Cheeky Chic
2007-05-07 00:19:53 · answer #3 · answered by Cheeky Chic 2 · 0⤊ 0⤋
Actual size = 27 x 1.5 cm = 40.5 cm
Perhaps you are measuring incorrectly?
If measurement was 2.1cm:-
Actual size = 27 x 2.1 cm = 57 cm (to nearest whole number)
This is then answer c)
2007-05-06 22:27:19 · answer #4 · answered by Como 7 · 0⤊ 0⤋
1.5cm times 27 = 40.5
did you measure it correctly or read the question wrongly?
2007-05-06 22:02:48 · answer #5 · answered by Anonymous · 0⤊ 0⤋